TEDS Data Dictionary

Variables in the 12 Year Dataset

The table on this page lists all 12 Year variables. This includes all item variables from the 12 Year booklets and tests, as well as derived variables that are based on 12 Year items.

The table does not include background variables that originate from other sources (either from admin data or from other study datasets). Such variables include IDs, twin sex and zygosity variables, the random variable and general exclusion variables. See the background variables page for details.

Variables are listed in alphabetical order in the table below. The columns of the table are:

  • Dataset variable name.
  • Item or derived variable?
  • Source of data:
    • twin web - from the twin web tests
    • twin booklet - from the child booklet
    • twin phone - from the twin TOWRE telephone test
    • parent booklet - from the parent booklet
    • parent NC - from the parent NC levels questionnaire
    • srs qnr - from the (parent) SRS CAST questionnaire
    • teacher qnr - from the teacher questionnaire
    • admin - administrative data, logged in the TEDS admin database
  • Dataset variable label
  • Data type:
    • integer - numeric whole numbers
    • decimal - numeric with fractional values
    • string - alphanumeric character strings
  • Variable type:
    • nominal - categorical, with arbitrary values
    • ordinal - categorical, with ordered numeric values
    • quantitative - numerical measurements of some concrete quantity
    • scale value - numerical measurement derived (usually) as a sum or mean of other variables
    In some cases, these distinctions are arbitrary. Binary variables are categorized as ordinal if they are scores (0/1), and nominal otherwise.
  • Coding or range of values - this shows the value coding used for nominal/ordinal variables, or an approximate range of values for quantitative and scale variables.
dataset variable nameitem or derived variable?source of datadataset variable labeldata typevariable typecoding or approximate range of values
larcort1/2derivedtwin webAuthor Recognition web at age 12: number of correct authors selected, 0-21 integerscale value0 to 21
lardata1/2itemtwin webAuthor Recognition web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
larinct1/2derivedtwin webAuthor Recognition web at age 12: number of incorrect authors selected, 0-21 integerscale value0 to 21
larstat1/2derivedtwin webAuthor Recognition web test status at 12, see value labelsintegernominal 0=not attempted, 2=completed successfully, 4=test completed but twin responded randomly
lartot1/2derivedtwin webAuthor Recognition web test corrected score at 12: correct minus incorrect (-21 to +21) integerscale value-21 to +21
larXXan1/2 (XX is the item number: 01-42)itemtwin web Author Recognition item XX [author name] selected, 1Y 0Ninteger nominal0=no (not selected), 1=yes (selected)
lbat1tm1/2derivedtwin webTotal web test time for 1st battery, if finished (minutes)decimalquantitative approx. 0-150 minutes
lbat2tm1/2derivedtwin webTotal web test time for 2nd battery, if finished (minutes)decimalquantitative approx. 0-150 minutes
lbatteryitemadminFamily battery group for 12yr web tests, 1=AB, 2=BAintegernominal1=AB group, 2=BA group
lbmi1/2derivedtwin bookletTwin BMI from self-reported height and weight at age 12 (kilograms per square metre) decimalscale valueapprox. 10 to 30 kilograms per square metre
lccha11/2itemtwin bookletChaos item 1, regular bedtime (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lccha1r1/2itemtwin bookletReversed version of chaos item 1 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lccha21/2itemtwin bookletChaos item 2, cannot hear yourself think (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lccha31/2itemtwin bookletChaos item 3, real zoo (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lccha41/2itemtwin bookletChaos item 4, stay on top (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lccha4r1/2itemtwin bookletReversed version of chaos item 4 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lccha51/2itemtwin bookletChaos item 5, television turned on (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lccha61/2itemtwin bookletChaos item 6, calm (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lccha6r1/2itemtwin bookletReversed version of chaos item 6 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lcchato1/2derivedtwin bookletChaos scale (child self-reported, from 6 items) at 12, 0-12decimal scale value0 to 12
lcdis11/2itemtwin bookletDiscipline item 1, smacked (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcdis21/2itemtwin bookletDiscipline item 2, shouted (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcdis31/2itemtwin bookletDiscipline item 3, explains (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcdis41/2itemtwin bookletDiscipline item 4, firm (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcdis51/2itemtwin bookletDiscipline item 5, joke (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcdis61/2itemtwin bookletDiscipline item 6, asks someone else (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcdisavot1/2derivedtwin booklet Parental discipline avoidance subscale (child self-reported) at 12, 0-4 decimalscale value 0 to 4
lcdisnegt1/2derivedtwin booklet Parental discipline negative/harsh subscale (child self-reported) at 12, 0-4 decimalscale value 0 to 4
lcdispost1/2derivedtwin booklet Parental discipline positive subscale (child self-reported) at 12, 0-4 decimalscale value 0 to 4
lcemfqt1/2derivedtwin bookletMFQ scale, enhanced version: 11 MFQ items + 2 SDQ items (child self-report) at 12, 0-26 decimalscale value0 to 26
lcg1/2derivedtwin webG composite scale from child web tests at 12, standardiseddecimalscale value approx. -3 to +3 (standardized)
lcgoo011/2itemtwin bookletHow Good item 1, reading (Child Qnr at 12), see value labelsintegerordinal 1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo021/2itemtwin bookletHow Good item 2, writing (Child Qnr at 12), see value labelsintegerordinal 1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo031/2itemtwin bookletHow Good item 3, spelling (Child Qnr at 12), see value labelsintegerordinal 1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo041/2itemtwin bookletHow Good item 4, number and money problems (Child Qnr at 12), see value labels integerordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo051/2itemtwin bookletHow Good item 5, maths in your head (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo061/2itemtwin bookletHow Good item 6, multiplying and dividing (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo071/2itemtwin bookletHow Good item 7, nature (Child Qnr at 12), see value labelsintegerordinal 1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo081/2itemtwin bookletHow Good item 8, testing things out (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo091/2itemtwin bookletHow Good item 9, finding out how things work (Child Qnr at 12), see value labels integerordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo101/2itemtwin bookletHow Good item 10, team games (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo111/2itemtwin bookletHow Good item 11, races and competitions (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lcgoo121/2itemtwin bookletHow Good item 12, PE classes (Child Qnr at 12), see value labelsinteger ordinal1=very good, 2=quite good, 3=doing OK, 4=not so good, 5=not at all good
lchtcm1/2itemtwin bookletTwin Height (Child Qnr at 12), centimetresintegerquantitativeapprox. 120 to 180 cm
lcliaca1/2derivedtwin bookletAcademic Liking scale, Child-self-rated at 12 (1-5)decimalscale value 1 to 5
lclieng1/2derivedtwin bookletEnglish Liking scale, Child-self-rated at 12 (1-5)decimalscale value 1 to 5
lclik011/2itemtwin bookletLike item 1, reading (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik021/2itemtwin bookletLike item 2, writing (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik031/2itemtwin bookletLike item 3, spelling (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik041/2itemtwin bookletLike item 4, number and money problems (Child Qnr at 12), see value labelsinteger ordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik051/2itemtwin bookletLike item 5, maths in your head (Child Qnr at 12), see value labelsinteger ordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik061/2itemtwin bookletLike item 6, multiplying and dividing (Child Qnr at 12), see value labelsinteger ordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik071/2itemtwin bookletLike item 7, nature (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik081/2itemtwin bookletLike item 8, testing things out (Child Qnr at 12), see value labelsinteger ordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik091/2itemtwin bookletLike item 9, finding out how things work (Child Qnr at 12), see value labels integerordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik101/2itemtwin bookletLike item 10, team games (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik111/2itemtwin bookletLike item 11, races and competitions (Child Qnr at 12), see value labelsinteger ordinal1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclik121/2itemtwin bookletLike item 12, PE classes (Child Qnr at 12), see value labelsintegerordinal 1=like it very much, 2=do like it, 3=it's OK, 4=don't like it, 5=don't like it at all
lclimat1/2derivedtwin bookletMaths Liking scale, Child-self-rated at 12 (1-5)decimalscale value 1 to 5
lcliphy1/2derivedtwin bookletPhysical Education Liking scale, Child-self-rated at 12 (1-5)decimal scale value1 to 5
lclisci1/2derivedtwin bookletScience Liking scale, Child-self-rated at 12 (1-5)decimalscale value 1 to 5
lcmd011/2itemtwin bookletMoods item 1, did not enjoy anything (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcmd021/2itemtwin bookletMoods item 2, did nothing (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd031/2itemtwin bookletMoods item 3, no good (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd041/2itemtwin bookletMoods item 4, cried a lot (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd051/2itemtwin bookletMoods item 5, hard to think (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd061/2itemtwin bookletMoods item 6, hated myself (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd071/2itemtwin bookletMoods item 7, bad person (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd081/2itemtwin bookletMoods item 8, lonely (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd091/2itemtwin bookletMoods item 9, nobody loved me (Child Qnr at 12), see value labelsintegerordinal 0=not true, 1=quite true, 2=very true
lcmd101/2itemtwin bookletMoods item 10, never as good as other kids (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcmd111/2itemtwin bookletMoods item 11, did everything wrong (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcmfqt1/2derivedtwin bookletMFQ scale from 11 MFQ items (child self-report) at 12, 0-22decimalscale value0 to 22
lcmoaca1/2derivedtwin bookletAcademic Overall Motivational scale, Child-self-rated at 12 (1-5)decimal scale value1 to 5
lcnv1/2derivedtwin webNon-verbal composite scale from child web tests at 12, standardiseddecimalscale valueapprox. -3 to +3 (standardized)
lconnctitemadminFamily reported internet connection type at home for 12yr, see value labelsinteger nominal0=unknown, 1=broadband, 2=dialup
lcpaaca1/2derivedtwin bookletAcademic Perceived Ability scale, Child-self-rated at 12 (1-5)decimal scale value1 to 5
lcpaeng1/2derivedtwin bookletEnglish Perceived Ability scale, Child-self-rated at 12 (1-5)decimal scale value1 to 5
lcpamat1/2derivedtwin bookletMaths Perceived Ability scale, Child-self-rated at 12 (1-5)decimalscale value1 to 5
lcpaphy1/2derivedtwin bookletPhysical Education Perceived Ability scale, Child-self-rated at 12 (1-5) decimalscale value1 to 5
lcpar11/2itemtwin bookletParental Feelings item 1, impatient (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar21/2itemtwin bookletParental Feelings item 2, happy (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar2r1/2itemtwin bookletReversed version of parental feelings item 2 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lcpar31/2itemtwin bookletParental Feelings item 3, funny (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar3r1/2itemtwin bookletReversed version of parental feelings item 3 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lcpar41/2itemtwin bookletParental Feelings item 4, leave alone (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar51/2itemtwin bookletParental Feelings item 5, angry (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar61/2itemtwin bookletParental Feelings item 6, close (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcpar6r1/2itemtwin bookletReversed version of parental feelings item 6 (child qnr at 12), see value labelsinteger ordinal0=very true, 1=quite true, 2=not true
lcpar71/2itemtwin bookletParental Feelings item 7, frustrated (Child Qnr at 12), see value labelsinteger ordinal0=not true, 1=quite true, 2=very true
lcparnegt1/2derivedtwin bookletParental Feelings negative subscale (child self-reported) at 12, 0-8decimal scale value0 to 8
lcparpost1/2derivedtwin bookletParental Feelings positive subscale (child self-reported) at 12, 0-6decimal scale value0 to 6
lcpart1/2derivedtwin bookletParental Feelings total scale (child self-reported) at 12, 0-14decimal scale value0 to 14
lcpasci1/2derivedtwin bookletScience Perceived Ability scale, Child-self-rated at 12 (1-5)decimal scale value1 to 5
lcpub11/2itemtwin bookletPuberty item 1, growth spurt (Child Qnr at 12), see value labelsinteger nominal0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcpub21/2itemtwin bookletPuberty item 2, body hair (Child Qnr at 12), see value labelsintegernominal 0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcpub31/2itemtwin bookletPuberty item 3, skin change (Child Qnr at 12), see value labelsintegernominal 0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcpub41/2itemtwin bookletPuberty item 4, breasts (Child Qnr at 12), see value labelsintegernominal 0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcpub51/2itemtwin bookletPuberty item 5, menstruate (Child Qnr at 12), 1yes 0nointegernominal 0=no, 1=yes
lcpub5age1/2derivedtwin bookletAge in years at first period (Child Qnr at 12), see value labelsintegerordinal 9=9 or less, 10, 11, 12 (years)
lcpub61/2itemtwin bookletPuberty item 6, voice deepen (Child Qnr at 12), see value labelsinteger nominal0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcpub71/2itemtwin bookletPuberty item 7, hair on face (Child Qnr at 12), see value labelsintegernominal 0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
lcqage1/2derivedadminAge of twin when 12yr child questionnaire returned, yearsdecimalquantitative approx. 10-13 (years)
lcqLLCage1derivedadmin Age of twin when 12yr child questionnaire returned (for use in LLC TRE), months integerquantitative approx. 118 to 154 (months)
lcqLLCdate1derivedadmin Date when 12yr child questionnaire returned (for use in LLC TRE), yyyy-mm string stringdate value approx. '2005-12' to '2007-10'
lcqdata1/2itemtwin bookletChild questionnaire data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lcsdqbeht1/2derivedtwin bookletSDQ Total Behaviour Problems scale (child self-report) at 12, 0-40decimalscale value0 to 40
lcsdqcon11/2itemtwin bookletSDQ Conduct item 1, often lose temper (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcon21/2itemtwin bookletSDQ Conduct item 2, do as I am told (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcon2r1/2itemtwin bookletReversed version of SDQ Conduct item 2 (child qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcon31/2itemtwin bookletSDQ Conduct item 3, fight a lot (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcon41/2itemtwin bookletSDQ Conduct item 4, lying or cheating (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcon51/2itemtwin bookletSDQ Conduct item 5, take things that are not mine (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqcont1/2derivedtwin bookletSDQ Conduct scale (child self-report) at 12, 0-10decimalscale value0 to 10
lcsdqemo11/2itemtwin bookletSDQ Emotion item 1, get a lot of headaches (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqemo21/2itemtwin bookletSDQ Emotion item 2, worry a lot (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqemo31/2itemtwin bookletSDQ Emotion item 3, often unhappy (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqemo41/2itemtwin bookletSDQ Emotion item 4, nervous in new situations (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqemo51/2itemtwin bookletSDQ Emotion item 5, many fears (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqemot1/2derivedtwin bookletSDQ Emotion scale (child self-report) at 12, 0-10decimalscale value0 to 10
lcsdqhyp11/2itemtwin bookletSDQ Hyperactivity item 1, restless (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp21/2itemtwin bookletSDQ Hyperactivity item 2, fidgeting (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp31/2itemtwin bookletSDQ Hyperactivity item 3, easily distracted (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp41/2itemtwin bookletSDQ Hyperactivity item 4, think before I do things (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp4r1/2itemtwin bookletReversed version of SDQ Hyperactivity item 4 (child qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp51/2itemtwin bookletSDQ Hyperactivity item 5, finish the work I am doing (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhyp5r1/2itemtwin bookletReversed version of SDQ Hyperactivity item 5 (child qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqhypt1/2derivedtwin bookletSDQ Hyperactivity scale (child self-report) at 12, 0-10decimalscale value0 to 10
lcsdqper11/2itemtwin bookletSDQ Peer item 1, usually on my own (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper21/2itemtwin bookletSDQ Peer item 2, have one good friend (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper2r1/2itemtwin bookletReversed version of SDQ Peer item 2 (child qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper31/2itemtwin bookletSDQ Peer item 3, liked by others my age (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper3r1/2itemtwin bookletReversed version of SDQ Peer item 3 (child qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper41/2itemtwin bookletSDQ Peer item 4, others pick on me (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqper51/2itemtwin bookletSDQ Peer item 5, get on better with adults (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqpert1/2derivedtwin bookletSDQ Peer Problems scale (child self-report) at 12, 0-10decimalscale value0 to 10
lcsdqpro11/2itemtwin bookletSDQ Prosocial item 1, nice to other people (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqpro21/2itemtwin bookletSDQ Prosocial item 2, share with others (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqpro31/2itemtwin bookletSDQ Prosocial item 3, helpful if someone is hurt (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqpro41/2itemtwin bookletSDQ Prosocial item 4, kind to younger children (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqpro51/2itemtwin bookletSDQ Prosocial item 5, volunteer to help others (Child Qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lcsdqprot1/2derivedtwin bookletSDQ Prosocial scale (child self-report) at 12, 0-10decimalscale value0 to 10
lctwage1/2derivedadminAge of twin when 12yr TOWRE test results were recorded, yearsdecimalquantitative approx. 10-13 (years)
lctwLLCage1derivedadmin Age of twin when 12yr child TOWRE phone test was logged (for use in LLC TRE), months integerquantitative approx. 123 to 158 (months)
lctwLLCdate1derivedadmin Date when 12yr child TOWRE phone test was logged (for use in LLC TRE), yyyy-mm string stringdate value approx. '2006-02' to '2007-12'
lcvb1/2derivedtwin webVerbal composite scale from child web tests at 12, standardiseddecimalscale value approx. -3 to +3 (standardized)
lcvic011/2itemtwin bookletVictim item 1, punched me (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic021/2itemtwin bookletVictim item 2, get me into trouble (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic031/2itemtwin bookletVictim item 3, called me names (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic041/2itemtwin bookletVictim item 4, took something without permission (Child Qnr at 12), see value labels integerordinal0=not at all, 1=once, 2=more than once
lcvic051/2itemtwin bookletVictim item 5, kicked me (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic061/2itemtwin bookletVictim item 6, turn friends against me (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic071/2itemtwin bookletVictim item 7, made fun of appearance (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic081/2itemtwin bookletVictim item 8, tried to break something (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic091/2itemtwin bookletVictim item 9, hurt me physically (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic101/2itemtwin bookletVictim item 10, refused to talk to me (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic111/2itemtwin bookletVictim item 11, made fun of me (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic121/2itemtwin bookletVictim item 12, stole something (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic131/2itemtwin bookletVictim item 13, beat me up (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic141/2itemtwin bookletVictim item 14, made others not talk to me (Child Qnr at 12), see value labels integerordinal0=not at all, 1=once, 2=more than once
lcvic151/2itemtwin bookletVictim item 15, swore at me(Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvic161/2itemtwin bookletVictim item 16, damaged some property (Child Qnr at 12), see value labelsinteger ordinal0=not at all, 1=once, 2=more than once
lcvicph1/2derivedtwin bookletVictimization Physical scale, Child self-rated at 12 (0-8)decimalscale value0 to 8
lcvicpr1/2derivedtwin bookletVictimization Property scale, Child self-rated at 12 (0-8)decimalscale value0 to 8
lcvicso1/2derivedtwin bookletVictimization Social Manipulation scale, Child self-rated at 12 (0-8)decimal scale value0 to 8
lcvicve1/2derivedtwin bookletVictimization Verbal scale, Child self-rated at 12 (0-8)decimalscale value0 to 8
lcwage1/2derivedadminAge of twin when web tests started at 12, yearsdecimalquantitative approx. 10-14 years
lcwLLCage1derivedadmin Age of twin when 12yr child web tests started (for use in LLC TRE), months integerquantitative approx. 122 to 154 (months)
lcwLLCdate1derivedadmin Date when 12yr child web tests started (for use in LLC TRE), yyyy-mm string stringdate value approx. '2006-02' to '2008-04'
lcwdata1/2derivedtwin webTwin web data (at least one test) present at 12, 1Y 0Nintegernominal 0=no, 1=yes
lcwtkg1/2itemtwin bookletTwin Weight (Child Qnr at 12), kilogramsintegerquantitativeapprox. 20 to 80 kg
lestcon1/2derivedtwin webConnection speed estimated from mean download times, see value labelsinteger nominal0=unknown, 1=broadband, 3=indeterminate, 0=unknown
leyatm1/2derivedtwin webItem answer time mean for Eyes test items (seconds)decimalquantitative approx. 0-20 seconds
leydata1/2itemtwin webEyes web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
leysess1/2itemtwin webNumber of sessions to complete Eyes web test at 12integerquantitative approx. 1-5 sessions
leystat1/2itemtwin webEyes web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
leytime1/2itemtwin webTime taken to complete Eyes web test at 12 (seconds)integerquantitative approx. 0-3000 seconds
leytot1/2itemtwin webTotal score for Eyes web test at 12 (0-28)integerscale value0 to 28
leyXXan1/2 (XX is the item number: 01-28)itemtwin web Eyes item XX response (12yr twin web), see value labelsinteger nominal1 to 4 (picture selected), -4=item crashed, -1=item timed out
leyXXsc1/2 (XX is the item number: 01-28)itemtwin web Eyes item XX score (12yr twin web), 1right 0wronginteger ordinal0=incorrect, 1=correct
lflatm1/2derivedtwin webItem answer time mean for Figurative Language test items (seconds)decimal quantitativeapprox. 0-60 seconds
lfldata1/2itemtwin webFigurative Language web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lflsess1/2itemtwin webNumber of sessions to complete Figurative Language web test at 12integer quantitativeapprox. 1-5 sessions
lflstat1/2itemtwin webFigurative Language web test status at 12, see value labelsintegernominal 0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lfltime1/2itemtwin webTime taken to complete Figurative Language web test at 12 (seconds)integer quantitativeapprox. 0-2000 seconds
lfltot1/2itemtwin webTotal score for Figurative Language web test at 12 (0-11)integerscale value0 to 11
lflXXan1/2 (XX is the item number, 01-11)itemtwin web Figurative Language item XX response (12yr twin web), see value labels integernominal1=A, 2=B, 3=C, 4=D (response selected), -4=item crashed, -1=item timed out
lflXXsc1/2 (XX is the item number, 01-11)itemtwin web Figurative Language item XX score (12yr twin web), 1right 0wrong integerordinal0=incorrect, 1=correct
lgkatm1/2derivedtwin webItem answer time mean for General Knowledge test items (seconds)decimal quantitativeapprox. 0-50 seconds
lgkdata1/2itemtwin webGeneral Knowledge web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lgksess1/2itemtwin webNumber of sessions to complete General Knowledge web test at 12integer quantitativeapprox. 1-5 sessions
lgkstat1/2itemtwin webGeneral Knowledge web test status at 12, see value labelsintegernominal 0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lgktime1/2itemtwin webTime taken to complete General Knowledge web test at 12 (seconds)integer quantitativeapprox. 0-1000 seconds
lgktot1/2itemtwin webTotal score for General Knowledge web test at 12 (0-30)integerscale value 0 to 30
lgktota1/2derivedtwin webAdjusted total score for General knowledge web test at 12 (0-30)decimalscale value0 to 30
lgkXXan1/2 (XX is the item number, 01-30)itemtwin web General Knowledge item XX response (12yr twin web), see value labels integernominal1=A, 2=B, 3=C, 4=D (response selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued
lgkXXsc1/2 (XX is the item number, 01-30)itemtwin web General Knowledge item XX score (12yr twin web), 1right 0wrong integerordinal0=incorrect, 1=correct
lgoatm1/2derivedtwin webItem answer time mean for GOAL test items (seconds)decimalquantitative approx. 0-100 seconds
lgodata1/2itemtwin webGOAL web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lgosess1/2itemtwin webNumber of sessions to complete GOAL web test at 12integerquantitative approx. 1-8 sessions
lgostat1/2itemtwin webGOAL web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lgotime1/2itemtwin webTime taken to complete GOAL web test at 12 (seconds)integerquantitative approx. 0-3000 seconds
lgotot1/2itemtwin webTotal score for GOAL web test at 12 (0-36)integerscale value0 to 36
lgotota1/2derivedtwin webAdjusted total score for GOAL web test at 12 (0-36)decimalscale value0 to 36
lgowave1/2itemtwin webWave of data collection for GOAL web test at 12, see value labels integerordinal1=wave 1 (2006), 2=wave 2 (2007), 3=follow-up wave (2008)
lgoXXan1/2 (XX is the item number, 01-36)itemtwin web GOAL item XX response (12yr twin web), see value labelsinteger nominal1=A, 2=B, 3=C, 4=D (response selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued
lgoXXsc1/2 (XX is the item number, 01-36)itemtwin web GOAL item XX score (12yr twin web), 1right 0wronginteger ordinal0=incorrect, 1=correct
lhsatm1/2derivedtwin webItem answer time mean for Hidden Shapes test items (seconds)decimalquantitative approx. 0-50 seconds
lhsdata1/2itemtwin webHidden Shapes web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lhssess1/2itemtwin webNumber of sessions to complete Hidden Shapes web test at 12integerquantitative approx. 1-5 sessions
lhsstat1/2itemtwin webHidden Shapes web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lhstime1/2itemtwin webTime taken to complete Hidden Shapes web test at 12 (seconds)integerquantitative approx. 0-1000 seconds
lhstot1/2itemtwin webTotal score for Hidden Shapes web test at 12 (0-27)integerscale value0 to 27
lhstota1/2derivedtwin webAdjusted total score for Hidden shapes web test at 12 (0-27)decimalscale value 0 to 27
lhsXXan1/2 (XX is the item number: 01-27)itemtwin web Hidden Shapes item XX response (12yr twin web), see value labels integernominal1 to 4 (picture selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
lhsXXsc1/2 (XX is the item number: 01-27)itemtwin web Hidden Shapes item XX score (12yr twin web), 1right 0wronginteger ordinal0=incorrect, 1=correct
linatm1/2derivedtwin webItem answer time mean for Inferences test items (seconds)decimalquantitative approx. 0-60 seconds
lindata1/2itemtwin webInferences web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
linsess1/2itemtwin webNumber of sessions to complete Inferences web test at 12integerquantitative approx. 1-5 sessions
linstat1/2itemtwin webInferences web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
linterntitemadminFamily reported home internet connection at 12, see value labelsintegernominal 0=unknown, 1=yes, 2=no
lintime1/2itemtwin webTime taken to complete Inferences web test at 12 (seconds)integerquantitative approx. 0-2000 seconds
lintot1/2itemtwin webTotal score for Inferences web test at 12 (0-33)integerscale value 0 to 33
linXXan1/2 (XX is the item number, 01-11)itemtwin web Inferences item XX response (12yr twin web), see value labels integernominal1=A, 2=B, 3=C, 4=D, 5=A and B, 6=A and C, 7=A and D, 8=B and C, 9=B and D, 10=C and D (response or responses selected, -4=item crashed, -1=item timed out
linXXsc1/2 (XX is the item number, 01-11)itemtwin web Inferences item XX score (12yr twin web), 3both right 1one right 0none right integerordinal0=neither answer correct, 1=one answer correct, 3=both answers correct
ljgatm1/2derivedtwin webItem answer time mean for Jigsaws test items (seconds)decimalquantitative approx. 0-50 seconds
ljgdata1/2itemtwin webJigsaws web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
ljgsess1/2itemtwin webNumber of sessions to complete Jigsaws web test at 12integerquantitative approx. 1-5 sessions
ljgstat1/2itemtwin webJigsaws web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
ljgtime1/2itemtwin webTime taken to complete Jigsaws web test at 12 (seconds)integerquantitative approx. 0-1000 seconds
ljgtot1/2itemtwin webTotal score for Jigsaws web test at 12 (0-28)integerscale value0 to 28
ljgtota1/2derivedtwin webAdjusted total score for Jigsaws web test at 12 (0-28)decimalscale value 0 to 28
ljgXXan1/2 (XX is the item number: 01-28)itemtwin web Jigsaws item XX response (12yr twin web), see value labelsinteger nominal1 to 4 (picture selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
ljgXXsc1/2 (XX is the item number: 01-28)itemtwin web Jigsaws item XX score (12yr twin web), 1right 0wronginteger ordinal0=incorrect, 1=correct
llitenf1/2derivedtwin webFull Literacy Environment scale (from 17 items), from twin web questionnaire at 12 (1-4) decimalscale value1 to 4
llitenv1/2derivedtwin webLiteracy Environment scale (from 5 items), from twin web questionnaire at 12 (1-4) decimalscale value1 to 4
llitenx1/2derivedtwin webExtended Literacy Environment scale (from 12 items), from twin web questionnaire at 12 (1-4) decimalscale value1 to 4
lma1tot1/2derivedtwin webMaths 12yr web score for sub-test 1 (Understanding Numbers), 0-33integerscale value0 to 33
lma2tot1/2derivedtwin webMaths 12yr web score for sub-test 2 (Non-Numerical Processes), 0-25integerscale value0 to 25
lma3tot1/2derivedtwin webMaths 12yr web score for sub-test 3 (Computation and Knowledge), 0-37integer scale value0 to 37
lmaatm1/2derivedtwin webItem answer time mean for Maths test items (seconds)decimalquantitative approx. 0-100 seconds
lmadata1/2itemtwin webMaths web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lmasess1/2itemtwin webNumber of sessions to complete Maths web test at 12integerquantitative approx. 1-12 sessions
lmastat1/2itemtwin webMaths web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lmatenv1/2derivedtwin webMaths Environment scale, from twin web questionnaire at 12 (1-4)decimalscale value1 to 4
lmatime1/2itemtwin webTime taken to complete Maths web test at 12 (seconds)integerquantitative approx. 0-5000 seconds
lmatot1/2itemtwin webTotal score for Maths web test at 12 (0-95)integerscale value0 to 95
lmatota1/2derivedtwin webAdjusted total score for Maths web test at 12 (0-95)decimalscale value 0 to 95
lmawave1/2itemtwin webWave of data collection for Maths web test at 12, see value labels integerordinal1=wave 1 (2006), 2=wave 2 (2007), 3=follow-up wave (2008)
lmXYZan1/2 (XYZ is the item number: X=subcategory, Y=level, Z=item; A-B in variable label is a reference to the source booklet)item twin webMaths Category X item XY0Z/A-B response (12yr twin web), [response coding varies by item] or -1=timeout -2=discontinue -3=credit -4=crashstring, integer or decimalnominal Responses may be coded in various ways, as either numbers or strings (strings are generally used where the response comprises more than one input). All items are additionally coded -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
lmXYZsc1/2 (XYZ is the item number: X=subcategory, Y=level, Z=item; A-B in variable label is a reference to the source booklet)item twin webMaths Category X item XY0Z/A-B score (12yr twin web), 1right 0wrongintegerordinal0=incorrect, 1=correct
lp2ac1/2derivedteacher qnr2-subject (English, Maths) overall mean NC level from parent-reported school report at 12, 2-7 decimal scale value2 to 7 (NC levels)
lp3ac1/2derivedteacher qnr3-subject (English, Maths, science) overall mean NC level from parent-reported school report at 12, 2-7 decimal scale value2 to 7 (NC levels)
lpap03r1/2itemparent bookletReversed version of APSD item 3 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpap07r1/2itemparent bookletReversed version of APSD item 7 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpap12r1/2itemparent bookletReversed version of APSD item 12 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpap18r1/2itemparent bookletReversed version of APSD item 18 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpap20r1/2itemparent bookletReversed version of APSD item 20 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpaps011/2itemparent bookletAPSD item 1, blames others (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps021/2itemparent bookletAPSD item 2, illegal activities (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps031/2itemparent bookletAPSD item 3, concerned about school (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps041/2itemparent bookletAPSD item 4, acts without thinking (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps051/2itemparent bookletAPSD item 5, emotions seem shallow (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps061/2itemparent bookletAPSD item 6, lies easily (parent qnr at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
lpaps071/2itemparent bookletAPSD item 7, good at keeping promises (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps081/2itemparent bookletAPSD item 8, brags excessively (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps091/2itemparent bookletAPSD item 9, gets bored easily (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps101/2itemparent bookletAPSD item 10, uses or cons (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps111/2itemparent bookletAPSD item 11, teases (parent qnr at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
lpaps121/2itemparent bookletAPSD item 12, feels bad and guilty (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps131/2itemparent bookletAPSD item 13, dangerous activities (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps141/2itemparent bookletAPSD item 14, can be charming (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps151/2itemparent bookletAPSD item 15, angry when corrected (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps161/2itemparent bookletAPSD item 16, better than other people (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpaps171/2itemparent bookletAPSD item 17, does not plan ahead (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps181/2itemparent bookletAPSD item 18, concerned about feelings (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpaps191/2itemparent bookletAPSD item 19, does not show feelings (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpaps201/2itemparent bookletAPSD item 20, keeps the same friends (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpapsdt1/2derivedparent bookletAPSD overall scale (parent) at 12, 0-40decimalscale value0 to 40
lpca01r1/2itemparent booklet and srs qnr Reversed version of CAST item 1 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca02r1/2itemparent booklet and srs qnr Reversed version of CAST item 2 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca03r1/2itemparent booklet and srs qnr Reversed version of CAST item 3 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca07r1/2itemparent booklet and srs qnr Reversed version of CAST item 7 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca08r1/2itemparent booklet and srs qnr Reversed version of CAST item 8 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca09r1/2itemparent booklet and srs qnr Reversed version of CAST item 9 (parent qnr at 12), 0yes 1nointeger nominal0=yes, 1=no
lpca11r1/2itemparent booklet and srs qnr Reversed version of CAST item 11 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca12r1/2itemparent booklet and srs qnr Reversed version of CAST item 12 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca13r1/2itemparent booklet and srs qnr Reversed version of CAST item 13 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca17r1/2itemparent booklet and srs qnr Reversed version of CAST item 17 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca18r1/2itemparent booklet and srs qnr Reversed version of CAST item 18 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca19r1/2itemparent booklet and srs qnr Reversed version of CAST item 19 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca21r1/2itemparent booklet and srs qnr Reversed version of CAST item 21 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca25r1/2itemparent booklet and srs qnr Reversed version of CAST item 25 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpca28r1/2itemparent booklet and srs qnr Reversed version of CAST item 28 (parent qnr at 12), 0yes 1no integernominal0=yes, 1=no
lpcacot1/2derivedparent bookletCAST Communication scale (parent) at 12, 0-12decimalscale value 0 to 12
lpcalt1/2derivedparent bookletAPSD Callous-Unemotional scale (parent) at 12, 0-12decimalscale value0 to 12
lpcanot1/2derivedparent bookletCAST Non-Social scale (parent) at 12, 0-7decimalscale value 0 to 7
lpcas011/2itemparent booklet and srs qnrCAST item 1, join in playing games (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas021/2itemparent booklet and srs qnrCAST item 2, spontaneously chat (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas031/2itemparent booklet and srs qnrCAST item 3, important to fit in (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas041/2itemparent booklet and srs qnrCAST item 4, notice unusual details (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas051/2itemparent booklet and srs qnrCAST item 5, take things literally (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas061/2itemparent booklet and srs qnrCAST item 6, do things over and over (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas071/2itemparent booklet and srs qnrCAST item 7, interact with other children (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas081/2itemparent booklet and srs qnrCAST item 8, keep a conversation going (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas091/2itemparent booklet and srs qnrCAST item 9, same interests as peers (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas101/2itemparent booklet and srs qnrCAST item 10, interest which takes up time (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas111/2itemparent booklet and srs qnrCAST item 11, have friends (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas121/2itemparent booklet and srs qnrCAST item 12, bring you things (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas131/2itemparent booklet and srs qnrCAST item 13, enjoy joking around (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas141/2itemparent booklet and srs qnrCAST item 14, rules for polite behaviour (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas151/2itemparent booklet and srs qnrCAST item 15, memory for details (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas161/2itemparent booklet and srs qnrCAST item 16, voice unusual (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas171/2itemparent booklet and srs qnrCAST item 17, people important (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas181/2itemparent booklet and srs qnrCAST item 18, turn-taking in conversation (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas191/2itemparent booklet and srs qnrCAST item 19, play imaginatively (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas201/2itemparent booklet and srs qnrCAST item 20, tactless (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas211/2itemparent booklet and srs qnrCAST item 21, normal eye contact (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas221/2itemparent booklet and srs qnrCAST item 22, unusual movement (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas231/2itemparent booklet and srs qnrCAST item 23, very one sided (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas241/2itemparent booklet and srs qnrCAST item 24, say you instead of I (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas251/2itemparent booklet and srs qnrCAST item 25, prefer imaginative activities (parent qnr at 12), 0no 1yes integernominal0=no, 1=yes
lpcas261/2itemparent booklet and srs qnrCAST item 26, lose the listener (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas271/2itemparent booklet and srs qnrCAST item 27, impose routines (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas281/2itemparent booklet and srs qnrCAST item 28, care how perceived (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas291/2itemparent booklet and srs qnrCAST item 29, turn conversations (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcas301/2itemparent booklet and srs qnrCAST item 30, unusual phrases (parent qnr at 12), 0no 1yesinteger nominal0=no, 1=yes
lpcasot1/2derivedparent bookletCAST Social scale (parent) at 12, 0-11decimalscale value0 to 11
lpcastt1/2derivedparent bookletCAST overall scale (parent) at 12, 0-30decimalscale value0 to 30
lpcatm1/2derivedtwin webItem answer time mean for Picture Completion test items (seconds)decimal quantitativeapprox. 0-15 seconds
lpcdata1/2itemtwin webPicture Completion web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lpchaos1itemparent bookletChaos item 1, regular bedtime routine (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpchaos1ritemparent bookletReversed version of chaos item 1 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpchaos2itemparent bookletChaos item 2, cannot hear yourself think (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpchaos3itemparent bookletChaos item 3, stay on top of things (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpchaos3ritemparent bookletReversed version of chaos item 3 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpchaos4itemparent bookletChaos item 4, television turned on (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpchaos5itemparent bookletChaos item 5, atmosphere is calm (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpchaos5ritemparent bookletReversed version of chaos item 5 (parent qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
lpchatotderivedparent bookletChaos scale (parent-reported, from 5 items) at 12, 0-10decimalscale value0 to 10
lpcon011/2itemparent bookletConners item 1, always on the go (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon021/2itemparent bookletConners item 2, sustained mental effort (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon031/2itemparent bookletConners item 3, sustaining attention (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon041/2itemparent bookletConners item 4, does not seem to listen (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon051/2itemparent bookletConners item 5, runs about or climbs (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon061/2itemparent bookletConners item 6, does not follow through (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon071/2itemparent bookletConners item 7, difficulty organising (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon081/2itemparent bookletConners item 8, talks excessively (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon091/2itemparent bookletConners item 9, fails to give close attention (parent qnr at 12), see value labels integerordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon101/2itemparent bookletConners item 10, waiting in lines (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon111/2itemparent bookletConners item 11, interrupts or intrudes (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon121/2itemparent bookletConners item 12, forgetful in daily activities (parent qnr at 12), see value labels integerordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon131/2itemparent bookletConners item 13, fidgets with hands (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon141/2itemparent bookletConners item 14, difficulty playing (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon151/2itemparent bookletConners item 15, loses things (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon161/2itemparent bookletConners item 16, leaves seat (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon171/2itemparent bookletConners item 17, easily distracted (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpcon181/2itemparent bookletConners item 18, blurts out answers (parent qnr at 12), see value labelsinteger ordinal0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
lpconhit1/2derivedparent bookletConners Hyperactivitiy-Impulsivity scale (parent) at 12, 0-27decimal scale value0 to 27
lpconint1/2derivedparent bookletConners Inattention scale (parent) at 12, 0-27decimalscale value 0 to 27
lpconnt1/2derivedparent bookletConners ADHD overall scale (parent) at 12, 0-54decimalscale value 0 to 54
lpcsess1/2itemtwin webNumber of sessions to complete Picture Completion web test at 12integer quantitativeapprox. 1-5 sessions
lpcstat1/2itemtwin webPicture Completion web test status at 12, see value labelsintegernominal 0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lpctime1/2itemtwin webTime taken to complete Picture Completion web test at 12 (seconds)integer quantitativeapprox. 0-1000 seconds
lpctot1/2itemtwin webTotal score for Picture Completion web test at 12 (0-30)integerscale value 0 to 30
lpcXXan1/2 (XX is the item number: p1, 01-30)itemtwin webPicture Completion item XX response (12yr twin web), grid number clicked or -1=timeout, -2=discontinued, -3=credited, -4=crashed integernominal1 to 120 (grid number clicked), -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
lpcXXsc1/2 (XX is the item number: p1, 01-30)itemtwin webPicture Completion item XX score (12yr twin web), 1right 0wrong integerordinal0=incorrect, 1=correct
lpdataderivedparent bookletParent data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lpdis011/2itemparent bookletDiscipline item 1, smack (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdis021/2itemparent bookletDiscipline item 2, shout (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdis031/2itemparent bookletDiscipline item 3, explain (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdis041/2itemparent bookletDiscipline item 4, firm or calm (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdis051/2itemparent bookletDiscipline item 5, make a joke (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdis061/2itemparent bookletDiscipline item 6, ask someone else (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpdisavot1/2derivedparent bookletParental Discipline avoidance subscale (parent-reported) at 12, 0-4decimalscale value 0 to 4
lpdisnegt1/2derivedparent bookletParental Discipline negative/harsh subscale (parent-reported) at 12, 0-4decimalscale value 0 to 4
lpdispost1/2derivedparent bookletParental Discipline positive subscale (parent-reported) at 12, 0-4decimalscale value 0 to 4
lpemfqt1/2derivedparent bookletMFQ scale, enhanced version: 11 MFQ items + 2 SDQ items (parent) at 12, 0-26 decimalscale value0 to 26
lpiatm1/2derivedtwin webItem answer time mean for PIAT test items (seconds)decimalquantitative approx. 0-15 seconds
lpidata1/2itemtwin webPIAT web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lpimpt1/2derivedparent bookletAPSD Impulsivity scale (parent) at 12, 0-10decimalscale value 0 to 10
lpisess1/2itemtwin webNumber of sessions to complete PIAT web test at 12integerquantitative approx. 1-8 sessions
lpistat1/2itemtwin webPIAT web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lpitime1/2itemtwin webTime taken to complete PIAT web test at 12 (seconds)integerquantitative approx. 0-2000 seconds
lpitot1/2itemtwin webTotal score for PIAT web test at 12 (0-82)integerscale value0 to 82
lpitota1/2derivedtwin webAdjusted total score for PIAT web test at 12 (0-82)decimalscale value0 to 82
lpiwave1/2itemtwin webWave of data collection for PIAT web test at 12, see value labels integerordinal1=wave 1 (2006), 2=wave 2 (2007), 3=follow-up wave (2008)
lpiXXan1/2 (XX is the item number: p3-5, 19-100)item twin webPIAT item XX response (12yr twin web), see value labels integernominal1 to 4 (picture selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
lpiXXsc1/2 (XX is the item number: p3-5, 19-100)item twin webPIAT item XX score (12yr twin web), 1right 0wrong integerordinal0=incorrect, 1=correct
lplit01itemparent bookletAdult Literacy item 1, left from right (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit02itemparent bookletAdult Literacy item 2, map reading (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit03itemparent bookletAdult Literacy item 3, reading aloud (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit04itemparent bookletAdult Literacy item 4, longer to read a page (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit05itemparent bookletAdult Literacy item 5, difficult to remember (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit06itemparent bookletAdult Literacy item 6, reading long books (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit07itemparent bookletAdult Literacy item 7, spelling poor (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit08itemparent bookletAdult Literacy item 8, writing difficult to read (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit09itemparent bookletAdult Literacy item 9, speak in public (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit10itemparent bookletAdult Literacy item 10, telephone messages (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit11itemparent bookletAdult Literacy item 11, say very long word (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit12itemparent bookletAdult Literacy item 12, sums in your head (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit13itemparent bookletAdult Literacy item 13, numbers mixed up (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit14itemparent bookletAdult Literacy item 14, months of year forwards (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit15itemparent bookletAdult Literacy item 15, months of year backwards (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit16itemparent bookletAdult Literacy item 16, mix up dates and times (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit17itemparent bookletAdult Literacy item 17, writing cheques (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit18itemparent bookletAdult Literacy item 18, find forms difficult (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lplit19itemparent bookletAdult Literacy item 19, mix up bus numbers (parent qnr at 12), see value labelsinteger ordinal0=never, 1=sometimes, 2=often
lplit20itemparent bookletAdult Literacy item 20, multiplication tables (parent qnr at 12), see value labels integerordinal0=never, 1=sometimes, 2=often
lpmd011/2itemparent bookletMood and Feelings item 1, did not enjoy anything (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd021/2itemparent bookletMood and Feelings item 2, felt so tired (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpmd031/2itemparent bookletMood and Feelings item 3, no good any more (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd041/2itemparent bookletMood and Feelings item 4, cried a lot (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpmd051/2itemparent bookletMood and Feelings item 5, hard to think properly (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd061/2itemparent bookletMood and Feelings item 6, hated him/herself (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd071/2itemparent bookletMood and Feelings item 7, bad person (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpmd081/2itemparent bookletMood and Feelings item 8, felt lonely (parent qnr at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
lpmd091/2itemparent bookletMood and Feelings item 9, nobody really loved (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd101/2itemparent bookletMood and Feelings item 10, never as good as others (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmd111/2itemparent bookletMood and Feelings item 11, did everything wrong (parent qnr at 12), see value labels integerordinal0=not true, 1=somewhat true, 2=certainly true
lpmfqt1/2derivedparent bookletMFQ scale from 11 MFQ items (parent) at 12, 0-22decimalscale value 0 to 22
lpnart1/2derivedparent bookletAPSD Narcissism scale (parent) at 12, 0-14decimalscale value0 to 14
lpncagederivedadminAge of twins when 12yr parent-reported NC levels returned, yearsdecimal quantitativeapprox. 10-13 years
lpncLLCagederivedadmin Age of twin when 12yr parent-reported NC levels returned (for use in LLC TRE), months integerquantitative approx. 128 to 157 (months)
lpncLLCdatederivedadmin Date when 12yr parent-reported NC levels returned (for use in LLC TRE), yyyy-mm string stringdate value approx. '2006-07' to '2007-12'
lpncdataitemparent NCParent-reported NC levels from school report present at 12, 1Y 0Ninteger nominal0=no, 1=yes
lpnceng1/2itemparent NCEnglish NC level reported by parent from school report at 12, 1-8integer ordinal2 to 7 (National Curriculum levels)
lpncmat1/2itemparent NCMaths NC level reported by parent from school report at 12, 1-8integer ordinal2 to 7 (National Curriculum levels)
lpncsci1/2itemparent NCScience NC level reported by parent from school report at 12, 1-8integer ordinal2 to 7 (National Curriculum levels)
lppar011/2itemparent bookletParental Feelings item 1, impatient (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar021/2itemparent bookletParental Feelings item 2, happy (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar02r1/2itemparent bookletReversed version of parental feelings item 2 (parent qnr at 12), see value labels integerordinal0=often, 1=sometimes, 2=rarely or never
lppar031/2itemparent bookletParental Feelings item 3, amused (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar03r1/2itemparent bookletReversed version of parental feelings item 3 (parent qnr at 12), see value labels integerordinal0=often, 1=sometimes, 2=rarely or never
lppar041/2itemparent bookletParental Feelings item 4, leave me alone (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar051/2itemparent bookletParental Feelings item 5, angry (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar061/2itemparent bookletParental Feelings item 6, close (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lppar06r1/2itemparent bookletReversed version of parental feelings item 6 (parent qnr at 12), see value labels integerordinal0=often, 1=sometimes, 2=rarely or never
lppar071/2itemparent bookletParental Feelings item 7, frustrated (parent qnr at 12), see value labelsinteger ordinal0=rarely or never, 1=sometimes, 2=often
lpparnegt1/2derivedparent bookletParental Feelings negative subscale (parent-reported) at 12, 0-8decimal scale value0 to 8
lpparpost1/2derivedparent bookletParental Feelings positive subscale (parent-reported) at 12, 0-6decimal scale value0 to 6
lppart1/2derivedparent bookletParental Feelings total scale (parent-reported) at 12, 0-14decimal scale value0 to 14
lpqagederivedadminAge of twins when 12yr parent questionnaire returned, yearsdecimalquantitative approx. 10-13 years
lpqLLCagederivedadmin Age of twin when 12yr parent questionnaire returned (for use in LLC TRE), months integerquantitative approx. 118 to 157 (months)
lpqLLCdatederivedadmin Date when 12yr parent questionnaire returned (for use in LLC TRE), yyyy-mm string stringdate value approx. '2005-11' to '2007-10'
lpqdataitemparent bookletParent booklet data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lpsdqbeht1/2derivedparent bookletSDQ Total Behaviour Problems scale (parent) at 12, 0-40decimalscale value0 to 40
lpsdqcon11/2itemparent bookletSDQ Conduct item 1, temper tantrums (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcon21/2itemparent bookletSDQ Conduct item 2, obedient (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcon2r1/2itemparent bookletReversed version of SDQ Conduct item 2 (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcon31/2itemparent bookletSDQ Conduct item 3, fights with other children (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcon41/2itemparent bookletSDQ Conduct item 4, lies or cheats (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcon51/2itemparent bookletSDQ Conduct item 5, steals (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqcont1/2derivedparent bookletSDQ Conduct scale (parent) at 12, 0-10decimalscale value0 to 10
lpsdqemo11/2itemparent bookletSDQ Emotion item 1, complains of headaches (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqemo21/2itemparent bookletSDQ Emotion item 2, many worries (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqemo31/2itemparent bookletSDQ Emotion item 3, often unhappy (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqemo41/2itemparent bookletSDQ Emotion item 4, nervous in new situations (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqemo51/2itemparent bookletSDQ Emotion item 5, many fears (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqemot1/2derivedparent bookletSDQ Emotion scale (parent) at 12, 0-10decimalscale value0 to 10
lpsdqhyp11/2itemparent bookletSDQ Hyperactivity item 1, restless (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp21/2itemparent bookletSDQ Hyperactivity item 2, constantly fidgeting (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp31/2itemparent bookletSDQ Hyperactivity item 3, easily distracted (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp41/2itemparent bookletSDQ Hyperactivity item 4, thinks things out (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp4r1/2itemparent bookletReversed version of SDQ Hyperactivity item 4 (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp51/2itemparent bookletSDQ Hyperactivity item 5, sees tasks through (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhyp5r1/2itemparent bookletReversed version of SDQ Hyperactivity item 5 (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqhypt1/2derivedparent bookletSDQ Hyperactivity scale (parent) at 12, 0-10decimalscale value0 to 10
lpsdqper11/2itemparent bookletSDQ Peer item 1, solitary (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper21/2itemparent bookletSDQ Peer item 2, at least one good friend (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper2r1/2itemparent bookletReversed version of SDQ Peer item 2 (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper31/2itemparent bookletSDQ Peer item 3, liked by other children (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper3r1/2itemparent bookletReversed version of SDQ Peer item 3 (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper41/2itemparent bookletSDQ Peer item 4, picked on or bullied (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqper51/2itemparent bookletSDQ Peer item 5, gets on better with adults (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqpert1/2derivedparent bookletSDQ Peer Problems scale (parent) at 12, 0-10decimalscale value0 to 10
lpsdqpro11/2itemparent bookletSDQ Prosocial item 1, considerate (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqpro21/2itemparent bookletSDQ Prosocial item 2, shares readily (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqpro31/2itemparent bookletSDQ Prosocial item 3, helpful if someone hurt (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqpro41/2itemparent bookletSDQ Prosocial item 4, kind to younger children (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqpro51/2itemparent bookletSDQ Prosocial item 5, often volunteers (parent qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
lpsdqprot1/2derivedparent bookletSDQ Prosocial scale (parent) at 12, 0-10decimalscale value0 to 10
lpubtot1/2derivedtwin bookletPuberty scale, for both sexes, at age 12 (1-4)decimalscale value 1 to 4
lpwconsitemparent webParent completed web consent form at 12, 1Y 0Nintegernominal0=no, 1=yes
lqartat1/2itemtwin webAuthor Recognition Test answer time (12yr twin web), secondsintegerquantitative approx. 0-300 seconds
lqbksan1/2itemtwin webMaths and Reading Qnr, books at home (12yr twin web, all cohorts), see value labelsinteger ordinal1=few (0-10), 2=enough to fill one shelf (11-25), 3=enough to fill one bookcase (26-100), 4=enough to fill several bookcases (more than 100)
lqcoman1/2itemtwin webMaths and Reading Qnr, computer at home (12yr twin web, cohort 1 only), 1yes 2nointeger nominal1=yes, 2=no
lqma1an1/2itemtwin webMaths and Reading Qnr, Maths item 1: textbook problems (12yr twin web, all cohorts), see value labelsintegerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqma2an1/2itemtwin webMaths and Reading Qnr, Maths item 2: group work (12yr twin web, all cohorts), see value labels integerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqma3an1/2itemtwin webMaths and Reading Qnr, Maths item 3: practical work (12yr twin web, all cohorts), see value labels integerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqma4an1/2itemtwin webMaths and Reading Qnr, Maths item 4: discuss problems (12yr twin web, all cohorts), see value labelsintegerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqma5an1/2itemtwin webMaths and Reading Qnr, Maths item 5: homework per day (12yr twin web, cohort 1 only), see value labelsintegerordinal1=none, 2=15 minutes, 3=30 minutes, 4=45 minutes or more
lqnatm1/2derivedtwin webItem answer time mean for Maths and Reading Questionnaire items (seconds)decimal quantitativeapprox. 0-50 seconds
lqndata1/2itemtwin webMaths and Reading web questionnaire data present at 12, 1Y 0Nintegernominal 0=no, 1=yes
lqnewan1/2itemtwin webMaths and Reading Qnr, family newspapers (12yr twin web, cohort 1 only) response, see value labels integernominal1=yes, 2=no, 3=don't know
lqnsess1/2itemtwin webNumber of sessions to complete Maths and Reading Questionnaire web test at 12integer quantitativeapprox. 1-5 sessions
lqnstat1/2itemtwin webWeb questionnaire test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lqntime1/2itemtwin webTime taken to complete Maths and Reading Questionnaire web test at 12 (seconds)integer quantitativeapprox. 0-1000 seconds
lqXXXat1/2
(XXX=section prefix and item number within the questionnaire, as for response items)		itemtwin webMaths and Reading Qnr, item XXX (12yr twin web, all cohorts) answer time, secondsintegerquantitativeapprox. 0-30 seconds
lqr01an1/2itemtwin webMaths and Reading Qnr, Reading item 1: talk with family (12yr twin web, all cohorts), see value labelsintegerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqr02an1/2itemtwin webMaths and Reading Qnr, Reading item 2: for fun (12yr twin web, all cohorts), see value labels integerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqr03an1/2itemtwin webMaths and Reading Qnr, Reading item 3: pages per day (12yr twin web, all cohorts), see value labels integerordinal1=none, 2=1 to 5, 3=6 to 10, 4=more than 10
lqr04an1/2itemtwin webMaths and Reading Qnr, Reading item 4: talk in class (12yr twin web, cohort 1 only), see value labelsintegerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqr05an1/2itemtwin webMaths and Reading Qnr, Reading item 5: write in class (12yr twin web, cohort 1 only), see value labelsintegerordinal1=never, 2=once a month, 3=once a week, 4=every day
lqr06an1/2itemtwin webMaths and Reading Qnr, Reading item 6: learn a lot (12yr twin web, not cohort 1), see value labels integerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr07an1/2itemtwin webMaths and Reading Qnr, Reading item 7: enjoy (12yr twin web, not cohort 1), see value labels integerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr08an1/2itemtwin webMaths and Reading Qnr, Reading item 8: favourite (12yr twin web, not cohort 1), see value labels integerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr09an1/2itemtwin webMaths and Reading Qnr, Reading item 9: free time (12yr twin web, not cohort 1), see value labels integerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr10an1/2itemtwin webMaths and Reading Qnr, Reading item 10: if teacher discusses (12yr twin web, not cohort 1), see value labelsintegerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr11an1/2itemtwin webMaths and Reading Qnr, Reading item 11: learn about interests (12yr twin web, not cohort 1), see value labelsintegerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr12an1/2itemtwin webMaths and Reading Qnr, Reading item 12: hobbies (12yr twin web, not cohort 1), see value labels integerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr13an1/2itemtwin webMaths and Reading Qnr, Reading item 13: favourite subjects (12yr twin web, not cohort 1), see value labelsintegerordinal1=this is a lot like me, 2=this is a little bit like me, 3=this is not at all like me
lqr14an1/2itemtwin webMaths and Reading Qnr, Reading item 14: lose track of time (12yr twin web, not cohort 1), see value labelsintegerordinal1=this is a lot like me, 2=this is a little bit like me, 3=this is not at all like me
lqr15an1/2itemtwin webMaths and Reading Qnr, Reading item 15: I have to (12yr twin web, not cohort 1), see value labels integerordinal1=this is a lot like me, 2=this is a little bit like me, 3=this is not at all like me
lqr16an1/2itemtwin webMaths and Reading Qnr, Reading item 16: make friends (12yr twin web, not cohort 1), see value labelsintegerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqr17an1/2itemtwin webMaths and Reading Qnr, Reading item 17: read it anyway (12yr twin web, not cohort 1), see value labelsintegerordinal1=never, 2=only sometimes, 3=often, 4=most of the time
lqtlkan1/2itemtwin webMaths and Reading Qnr, talk about school with family (12yr twin web, all cohorts), see value labels integerordinal1=never, 2=monthly, 3=weekly, 4=twice a week, 5=every day
lqtvhan1/2itemtwin webMaths and Reading Qnr, hours TV on school days (12yr twin web, all cohorts), see value labels integerordinal1=none, 2=one hour or less, 3=two to three hours, 4=over three hours
lrvatm1/2derivedtwin webItem answer time mean for Raven test items (seconds)decimalquantitative approx. 0-60 seconds
lrvdata1/2itemtwin webRavens web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lrvsess1/2itemtwin webNumber of sessions to complete Ravens web test at 12integerquantitative approx. 1-5 sessions
lrvstat1/2itemtwin webRavens web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lrvtime1/2itemtwin webTime taken to complete Ravens web test at 12 (seconds)integerquantitative approx. 0-2000 seconds
lrvtot1/2itemtwin webTotal score for Ravens web test at 12 (0-24)integerscale value0 to 24
lrvtota1/2derivedtwin webAdjusted total score for Ravens web test at 12 (0-24)decimalscale value 0 to 24
lrXYYan1/2 (X is the sub-test C/D/E/F, YY is the item number 01/03/05/07/09/11)itemtwin webRaven category X item YY response (12yr twin web), see value labelsinteger nominal1 to 8 (picture selected), -4=item crashed, -2=item discontinued
lrXYYsc1/2 (X is the sub-test C/D/E/F, YY is the item number 01/03/05/07/09/11)itemtwin webRaven category X item YY score (12yr twin web), 1right 0wrongintegerordinal 0=incorrect, 1=correct
lsameschitemadminTwins attending the same school at age 12, 1Y 0Nintegernominal0=no, 1=yes
lsametchitemadminTwins taught by the same teacher at age 12, 1Y 0Nintegernominal0=no, 1=yes
lsrsdataitemsrs qnrSRS parent CAST data (collected at 12) present, 1Y 0Nintegernominal 0=no, 1=yes
lt2a1/2derivedteacher qnrTeacher 2-subject (English, Maths) Academic achievement at 12, standardiseddecimal scale valueapprox. -3 to +3 (standardized)
lt2ac1/2derivedteacher qnrTeacher 2-subject (English, Maths) overall mean NC level at 12, 1-9decimal scale value1 to 9 (NC levels)
lt3a1/2derivedteacher qnrTeacher 3-subject Academic achievement at 12, standardiseddecimalscale value approx. -3 to +3 (standardized)
lt3ac1/2derivedteacher qnrTeacher 3-subject (English, Maths, science) overall mean NC level at 12, 1-9decimal scale value1 to 9 (NC levels)
ltap03r1/2itemteacher qnrReversed version of APSD item 3 (teacher qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
ltap07r1/2itemteacher qnrReversed version of APSD item 7 (teacher qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
ltap12r1/2itemteacher qnrReversed version of APSD item 12 (teacher qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
ltap18r1/2itemteacher qnrReversed version of APSD item 18 (teacher qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
ltap20r1/2itemteacher qnrReversed version of APSD item 20 (teacher qnr at 12), see value labelsinteger ordinal0=certainly true, 1=somewhat true, 2=not true
ltaps011/2itemteacher qnrAPSD item 1, blames others (teacher at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
ltaps021/2itemteacher qnrAPSD item 2, illegal activities (teacher at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
ltaps031/2itemteacher qnrAPSD item 3, concerned about school (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps041/2itemteacher qnrAPSD item 4, acts without thinking (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps051/2itemteacher qnrAPSD item 5, emotions seem shallow (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps061/2itemteacher qnrAPSD item 6, lies easily (teacher at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
ltaps071/2itemteacher qnrAPSD item 7, good at keeping promises (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps081/2itemteacher qnrAPSD item 8, brags excessively (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps091/2itemteacher qnrAPSD item 9, gets bored easily (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps101/2itemteacher qnrAPSD item 10, uses or cons other people (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps111/2itemteacher qnrAPSD item 11, teases (teacher at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
ltaps121/2itemteacher qnrAPSD item 12, feels bad or guilty (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps131/2itemteacher qnrAPSD item 13, dangerous activities (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps141/2itemteacher qnrAPSD item 14, can be charming (teacher at 12), see value labelsintegerordinal 0=not true, 1=somewhat true, 2=certainly true
ltaps151/2itemteacher qnrAPSD item 15, becomes angry (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps161/2itemteacher qnrAPSD item 16, better than other people (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps171/2itemteacher qnrAPSD item 17, does not plan ahead (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps181/2itemteacher qnrAPSD item 18, concerned about feelings (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps191/2itemteacher qnrAPSD item 19, does not show feelings (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltaps201/2itemteacher qnrAPSD item 20, keeps same friends (teacher at 12), see value labelsinteger ordinal0=not true, 1=somewhat true, 2=certainly true
ltapsdt1/2derivedteacher qnrAPSD overall scale (teacher) at 12, 0-40decimalscale value0 to 40
ltca01r1/2itemteacher qnrReversed version of CAST item 1 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca02r1/2itemteacher qnrReversed version of CAST item 2 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca03r1/2itemteacher qnrReversed version of CAST item 3 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca07r1/2itemteacher qnrReversed version of CAST item 7 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca08r1/2itemteacher qnrReversed version of CAST item 8 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca09r1/2itemteacher qnrReversed version of CAST item 9 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca11r1/2itemteacher qnrReversed version of CAST item 11 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca12r1/2itemteacher qnrReversed version of CAST item 12 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca13r1/2itemteacher qnrReversed version of CAST item 13 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca17r1/2itemteacher qnrReversed version of CAST item 17 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca18r1/2itemteacher qnrReversed version of CAST item 18 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca19r1/2itemteacher qnrReversed version of CAST item 19 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca21r1/2itemteacher qnrReversed version of CAST item 21 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca25r1/2itemteacher qnrReversed version of CAST item 25 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltca28r1/2itemteacher qnrReversed version of CAST item 28 (teacher qnr at 12), 0yes 1nointegernominal 0=yes, 1=no
ltcacot1/2derivedteacher qnrCAST Communication scale (teacher) at 12, 0-12decimalscale value0 to 12
ltcalt1/2derivedteacher qnrAPSD Callous-Unemotional scale (teacher) at 12, 0-12decimal scale value0 to 12
ltcanot1/2derivedteacher qnrCAST Non-Social scale (teacher) at 12, 0-7decimalscale value0 to 7
ltcas011/2itemteacher qnrCAST item 1, join in playing games (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas021/2itemteacher qnrCAST item 2, spontaneously for chat (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas031/2itemteacher qnrCAST item 3, important to fit it (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas041/2itemteacher qnrCAST item 4, notice unusual details (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas051/2itemteacher qnrCAST item 5, take things literally (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas061/2itemteacher qnrCAST item 6, do things over and over (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas071/2itemteacher qnrCAST item 7, interact with other children (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas081/2itemteacher qnrCAST item 8, two-way conversation (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas091/2itemteacher qnrCAST item 9, same interests as peers (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas101/2itemteacher qnrCAST item 10, interest takes up so much time (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas111/2itemteacher qnrCAST item 11, have friends (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas121/2itemteacher qnrCAST item 12, bring you things (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas131/2itemteacher qnrCAST item 13, enjoy joking around (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas141/2itemteacher qnrCAST item 14, difficulty understanding rules (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas151/2itemteacher qnrCAST item 15, unusual memory for details (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas161/2itemteacher qnrCAST item 16, voice unusual (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas171/2itemteacher qnrCAST item 17, people important (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas181/2itemteacher qnrCAST item 18, turn-taking in conversation (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas191/2itemteacher qnrCAST item 19, play imaginatively (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas201/2itemteacher qnrCAST item 20, tactless (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas211/2itemteacher qnrCAST item 21, normal eye contact (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas221/2itemteacher qnrCAST item 22, repetitive movements (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas231/2itemteacher qnrCAST item 23, social behaviour one-sided (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas241/2itemteacher qnrCAST item 24, sometimes says you (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas251/2itemteacher qnrCAST item 25, prefer imaginative activities (teacher at 12), 1yes 0nointeger nominal0=no, 1=yes
ltcas261/2itemteacher qnrCAST item 26, lose the listener (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas271/2itemteacher qnrCAST item 27, impose routines (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas281/2itemteacher qnrCAST item 28, care how perceived (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas291/2itemteacher qnrCAST item 29, turn conversations (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcas301/2itemteacher qnrCAST item 30, unusual phrases (teacher at 12), 1yes 0nointegernominal 0=no, 1=yes
ltcasot1/2derivedteacher qnrCAST Social scale (teacher) at 12, 0-11decimalscale value0 to 11
ltcastt1/2derivedteacher qnrCAST overall scale (teacher) at 12, 0-30decimalscale value0 to 30
lte1/2derivedteacher qnrTeacher English achievement composite at 12, standardiseddecimalscale valueapprox. -3 to +3 (standardized)
lteng1/2derivedteacher qnrTeacher English mean NC level at 12, 1-9decimalscale1-9 (National Curriculum levels)
ltengre1/2itemteacher qnrEnglish Reading NC level (teacher at 12), 1-9integerordinal1-8, 9=exceptional performance (National Curriculum levels)
ltengsp1/2itemteacher qnrEnglish Speaking and Listening NC level (teacher at 12), 1-9integerordinal 1-8, 9=exceptional performance (National Curriculum levels)
ltengwr1/2itemteacher qnrEnglish Writing NC level (teacher at 12), 1-9integerordinal1-8, 9=exceptional performance (National Curriculum levels)
ltimpt1/2derivedteacher qnrAPSD Impulsivity scale (teacher) at 12, 0-10decimalscale value0 to 10
ltm1/2derivedteacher qnrTeacher Maths achievement composite at 12, standardiseddecimalscale valueapprox. -3 to +3 (standardized)
ltmat1/2derivedteacher qnrTeacher Maths mean NC level at 12, 1-9decimalscale1-9 (National Curriculum levels)
ltmatha1/2itemteacher qnrMaths Handling Data NC level (teacher at 12), 1-9integerordinal1-8, 9=exceptional performance (National Curriculum levels)
ltmatnu1/2itemteacher qnrMaths Number and Algebra NC level (teacher at 12), 1-9integerordinal 1-8, 9=exceptional performance (National Curriculum levels)
ltmatsh1/2itemteacher qnrMaths Shape, Space and Measures NC level (teacher at 12), 1-9integerordinal 1-8, 9=exceptional performance (National Curriculum levels)
ltmatus1/2itemteacher qnrMaths Using and Applying Mathematics NC level (teacher at 12), 1-9integer ordinal1-8, 9=exceptional performance (National Curriculum levels)
ltnart1/2derivedteacher qnrAPSD Narcissism scale (teacher) at 12, 0-14decimalscale value0 to 14
ltoatm1/2derivedtwin webItem answer time mean for TOAL test items (seconds)decimalquantitative approx. 0-20 seconds
ltobasal1/2derivedtwin webPosition of lowest item of basal in TOAL web test at 12 (1-31)integerordinal 1 to 31
ltoceiling1/2derivedtwin webPosition of highest item of ceiling in TOAL web test at 12 (3-35)integer ordinal3 to 35
ltodata1/2itemtwin webTOAL web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
ltosess1/2itemtwin webNumber of sessions to complete TOAL web test at 12integerquantitative approx. 1-10 sessions
ltostat1/2itemtwin webTOAL web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
ltotime1/2itemtwin webTime taken to complete TOAL web test at 12 (seconds)integerquantitative approx. 0-2000 seconds
ltotot1/2derivedtwin webTotal score for TOAL web test at 12 (0-35)integerscale value0 to 35
ltotota1/2derivedtwin webAdjusted total score for TOAL web test at 12 (0-35)decimalscale value0 to 35
ltottm1/2derivedtwin webTotal web test time for both batteries, if finished (minutes)decimal quantitativeapprox. 0-300 minutes
ltoXXan1/2 (XX is the item number, p1 and 01-35)item twin webTOAL item XX response (12yr twin web), see value labels integernominal1=A, 2=B, 3=C, 4=A and B, 5=A and C, 6=B and C (response or responses selected, -4=item crashed, -3=item credited due to branching, -2=item discontinued, -1=item timed out
ltoXXsc1/2 (XX is the item number, p1 and 01-35)item twin webTOAL item XX score (12yr twin web), 1right 0wrong integerordinal0=incorrect, 1=correct
ltowt1/2derivedtwin phoneTOWRE composite score from child phone test at 12, standardiseddecimalscale value approx. -2 to +2 (standardized)
ltqage1/2derivedadminAge of twin when 12yr teacher questionnaire returned, yearsdecimalquantitative approx. 10-13 years
ltqdata1/2itemteacher qnrTeacher questionnaire data present at 12, 1Y 0Nintegernominal 0=no, 1=yes
ltqLLCage1derivedadmin Age of twin when 12yr teacher questionnaire returned (for use in LLC TRE), months integerquantitative approx. 123 to 152 (months)
ltqLLCdate1derivedadmin Date when 12yr teacher questionnaire returned (for use in LLC TRE), yyyy-mm string stringdate value approx. '2006-03' to '2007-09'
lts1/2derivedteacher qnrTeacher Science achievement composite at 12, standardiseddecimalscale valueapprox. -3 to +3 (standardized)
ltsci1/2derivedteacher qnrTeacher Science mean NC level at 12, 1-9decimalscale1-9 (National Curriculum levels)
ltscili1/2itemteacher qnrScience Life Processes and Living Things NC level (teacher at 12), 1-9integer ordinal1-8, 9=exceptional performance (National Curriculum levels)
ltscima1/2itemteacher qnrScience Materials and their Properties NC level (teacher at 12), 1-9integer ordinal1-8, 9=exceptional performance (National Curriculum levels)
ltsciph1/2itemteacher qnrScience Physical Processes NC level (teacher at 12), 1-9integerordinal 1-8, 9=exceptional performance (National Curriculum levels)
ltscisc1/2itemteacher qnrScience Scientific Enquiry NC level (teacher at 12), 1-9integerordinal 1-8, 9=exceptional performance (National Curriculum levels)
ltsdqbeht1/2derivedteacher qnrSDQ Total Behaviour Problems scale (teacher) at 12, 0-40decimalscale value0 to 40
ltsdqcon11/2itemteacher qnrSDQ Conduct item 1, temper tantrums (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcon21/2itemteacher qnrSDQ Conduct item 2, obedient (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcon2r1/2itemteacher qnrReversed version of SDQ Conduct item 2 (teacher qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcon31/2itemteacher qnrSDQ Conduct item 3, fights (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcon41/2itemteacher qnrSDQ Conduct item 4, often lies or cheats (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcon51/2itemteacher qnrSDQ Conduct item 5, steals (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqcont1/2derivedteacher qnrSDQ Conduct scale (teacher) at 12, 0-10decimalscale value0 to 10
ltsdqemo11/2itemteacher qnrSDQ Emotion item 1, headaches (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqemo21/2itemteacher qnrSDQ Emotion item 2, many worries (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqemo31/2itemteacher qnrSDQ Emotion item 3, unhappy (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqemo41/2itemteacher qnrSDQ Emotion item 4, nervous in new situations (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqemo51/2itemteacher qnrSDQ Emotion item 5, many fears (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqemot1/2derivedteacher qnrSDQ Emotion scale (teacher) at 12, 0-10decimalscale value0 to 10
ltsdqhyp11/2itemteacher qnrSDQ Hyperactivity item 1, restless (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp21/2itemteacher qnrSDQ Hyperactivity item 2, constantly fidgeting (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp31/2itemteacher qnrSDQ Hyperactivity item 3, easily distracted (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp41/2itemteacher qnrSDQ Hyperactivity item 4, thinks things out (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp4r1/2itemteacher qnrReversed version of SDQ Hyperactivity item 4 (teacher qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp51/2itemteacher qnrSDQ Hyperactivity item 5, sees tasks through (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhyp5r1/2itemteacher qnrReversed version of SDQ Hyperactivity item 5 (teacher qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqhypt1/2derivedteacher qnrSDQ Hyperactivity scale (teacher) at 12, 0-10decimalscale value0 to 10
ltsdqper11/2itemteacher qnrSDQ Peer item 1, solitary (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper21/2itemteacher qnrSDQ Peer item 2, at least one good friend (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper2r1/2itemteacher qnrReversed version of SDQ Peer item 2 (teacher qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper31/2itemteacher qnrSDQ Peer item 3, generally liked (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper3r1/2itemteacher qnrReversed version of SDQ Peer item 3 (teacher qnr at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper41/2itemteacher qnrSDQ Peer item 4, picked on (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqper51/2itemteacher qnrSDQ Peer item 5, gets on better with adults (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqpert1/2derivedteacher qnrSDQ Peer Problems scale (teacher) at 12, 0-10decimalscale value0 to 10
ltsdqpro11/2itemteacher qnrSDQ Prosocial item 1, considerate (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqpro21/2itemteacher qnrSDQ Prosocial item 2, shares readily (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqpro31/2itemteacher qnrSDQ Prosocial item 3, helpful if someone hurt (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqpro41/2itemteacher qnrSDQ Prosocial item 4, kind to younger children (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqpro51/2itemteacher qnrSDQ Prosocial item 5, volunteers (teacher at 12), see value labelsintegerordinal0=not true, 1=quite true, 2=very true
ltsdqprot1/2derivedteacher qnrSDQ Prosocial scale (teacher) at 12, 0-10decimalscale value0 to 10
ltsen1/2itemteacher qnrStatement of SEN (teacher at 12), 1yes 0nointegernominal0=no, 1=yes
ltsenrg1/2itemteacher qnrOn the SEN register (teacher at 12), 1yes 0nointegernominal0=no, 1=yes
ltwdata1/2itemtwin phoneTwin TOWRE phone test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
ltwelvyrderived-12yr data present, 1Y 0N integernominal0=no, 1=yes
ltwnwt1/2itemtwin phoneTOWRE Non-Word main test total score at 12, 0-63integerscale value0 to 63
ltwwdt1/2itemtwin phoneTOWRE Word main test total score at 12, 0-104integerscale value0 to 104
lvcatm1/2derivedtwin webItem answer time mean for Vocabulary test items (seconds)decimalquantitative approx. 0-30 seconds
lvcdata1/2itemtwin webVocabulary web test data present at 12, 1Y 0Nintegernominal0=no, 1=yes
lvcsess1/2itemtwin webNumber of sessions to complete Vocabulary web test at 12integerquantitative approx. 1-5 sessions
lvcstat1/2itemtwin webVocabulary web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lvctime1/2itemtwin webTime taken to complete Vocabulary web test at 12 (seconds)integerquantitative approx. 0-1000 seconds
lvctot1/2itemtwin webTotal score for Vocabulary web test at 12 (0-60)integerscale value 0 to 60
lvctota1/2derivedtwin webAdjusted total score for Vocabulary web test at 12 (0-60)decimalscale value 0 to 60
lvcXXan1/2 (XX is the item number, 01-30)itemtwin web Vocabulary item XX response (12yr twin web), see value labels integernominal1=A, 2=B, 3=C, 4=D (picture selected), -4=item crashed, -3=item credited due to branching, -2=item discontinued
lvcXXsc1/2 (XX is the item number, 01-30)itemtwin web Vocabulary item XX score (12yr twin web), 2right 1partly right 0wrong integerordinal0=incorrect, 1=partly correct, 2=correct
lwaveitemadminWave of 12yr study, 1=cohort 1 (contacted 2005/06), 2=cohorts 2/3/4 (contacted 2006/07)integer nominal1=cohort 1 (contacted 05/06), 2=cohorts2/3/4 (contacted 06/07)
lynatm1/2derivedtwin webItem answer time mean for Yes/No test items (seconds)decimalquantitative approx. 1-2 seconds
lyndata1/2itemtwin webYes/No (Reading Fluency) web test data present at 12, 1Y 0Nintegernominal 0=no, 1=yes
lynsess1/2itemtwin webNumber of sessions to complete Yes/No web test at 12integerquantitative approx. 1-2 sessions
lynstat1/2itemtwin webYes/No web test status at 12, see value labelsintegernominal0=not attempted, 1=started but not completed, 2=completed successfully, 3=test abandoned or crashed or otherwise compromised, 4=test completed but twin responded randomly
lyntime1/2itemtwin webTime taken to complete Yes/No web test at 12 (seconds)integerquantitative approx. 0-3180 seconds
lyntot1/2itemtwin webTotal score for Yes/No web test at 12 (0-100)integerscale value0 to 98
lywave1/2itemtwin webWave of data collection for Yes/No web test at 12, see value labels integerordinal1=wave 1 (2006), 2=wave 2 (2007), 3=follow-up wave (2008)
lynXXan1/2 (XX is the item number, 01-98)itemtwin web Yes/No item XX response (12yr twin web), see value labelsinteger nominal1=yes, 2=no, -4=item crashed, -2=item discontinued, -1=item timed out
lynXXsc1/2 (XX is the item number, 01-98)itemtwin web Yes/No item XX score (12yr twin web), 1right 0wronginteger ordinal0=incorrect, 1=correct