TEDS Data Dictionary

Variables in the 14 Year Dataset

The table on this page lists all 14 Year variables. This includes all item variables from the 14 Year booklets and web tests, as well as derived variables that are based on 14 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
- parent booklet - from the parent booklet
- slq qnr - from the (parent) SLQ 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 name	item or derived variable?	source of data	dataset variable label	data type	variable type	coding or approximate range of values
n14year	derived	-	14yr data present, 1Y 0N	integer	nominal	0=no, 1=yes
ncact11/2	item	twin booklet	Extra Curricular Activities item 1: sports (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact1h1/2	item	twin booklet	Extra Curricular Activities item 1: sports (child qnr at 14) - hours per week	decimal	quantitative	0 to 35 (hours per week)
ncact21/2	item	twin booklet	Extra Curricular Activities item 2: computer games (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact2h1/2	item	twin booklet	Extra Curricular Activities item 2: computer games (child qnr at 14) - hours per week	decimal	quantitative	0 to 35 (hours per week)
ncact31/2	item	twin booklet	Extra Curricular Activities item 3: watching TV/DVDs (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact3h1/2	item	twin booklet	Extra Curricular Activities item 3: watching TV/DVDs (child qnr at 14) - hours per week	decimal	quantitative	0 to 35 (hours per week)
ncact41/2	item	twin booklet	Extra Curricular Activities item 4: organised groups (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact4h1/2	item	twin booklet	Extra Curricular Activities item 4: organised groups (child qnr at 14) - hours per week	decimal	quantitative	0 to 15 (hours per week)
ncact51/2	item	twin booklet	Extra Curricular Activities item 5: outside with friends (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact5h1/2	item	twin booklet	Extra Curricular Activities item 5: outside with friends (child qnr at 14) - hours per week	decimal	quantitative	0 to 35 (hours per week)
ncact61/2	item	twin booklet	Extra Curricular Activities item 6: reading (child qnr at 14), see value labels	integer	nominal	1=enjoy a lot, 2=enjoy a bit, 3=its OK, 4=dont enjoy it much, 5=dont enjoy at all, 6=never done
ncact6h1/2	item	twin booklet	Extra Curricular Activities item 6: reading (child qnr at 14) - hours per week	decimal	quantitative	0 to 30 (hours per week)
ncbmi1/2	derived	twin booklet	Twin BMI (child qnr at 14), kilograms per square metre	decimal	quantitative	approx 12 to 35 (kilograms per square metre)
nccha11/2	item	twin booklet	Chaos item 1, regular routine first thing (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha1r1/2	item	twin booklet	Reversed version of child Chaos item 1 (child qnr at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
nccha21/2	item	twin booklet	Chaos item 2, cannot hear yourself think (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha31/2	item	twin booklet	Chaos item 3, real zoo (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha41/2	item	twin booklet	Chaos item 4, stay on top (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha4r1/2	item	twin booklet	Reversed version of child Chaos item 4 (child qnr at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
nccha51/2	item	twin booklet	Chaos item 5, television turned on (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha61/2	item	twin booklet	Chaos item 6, calm (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
nccha6r1/2	item	twin booklet	Reversed version of child Chaos item 6 (child qnr at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
ncchato1/2	derived	twin booklet	Chaos at home total scale at 14 (child), 0-12	decimal	scale value	0 to 12
nccoale1/2	item	twin booklet	Hope to follow A-level courses (child qnr at 14), 1Y 0N	integer	nominal	0=no, 1=yes
nccoapp1/2	item	twin booklet	Hope to follow Apprenticship courses (child qnr at 14), 1Y 0N	integer	nominal	0=no, 1=yes
nccodeg1/2	item	twin booklet	Hope to follow Degree courses (child qnr at 14), 1Y 0N	integer	nominal	0=no, 1=yes
nccogcs1/2	item	twin booklet	Hope to follow GCSE courses (child qnr at 14), 1Y 0N	integer	nominal	0=no, 1=yes
nccon011/2	item	twin booklet	Conners item 1, make careless mistakes (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon021/2	item	twin booklet	Conners item 2, trouble keeping attention focussed (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon031/2	item	twin booklet	Conners item 3, trouble listening (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon041/2	item	twin booklet	Conners item 4, trouble finishing work (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon051/2	item	twin booklet	Conners item 5, problems organising (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon061/2	item	twin booklet	Conners item 6, dont like work where I have to think (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon071/2	item	twin booklet	Conners item 7, lose things (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon081/2	item	twin booklet	Conners item 8, distracted (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon091/2	item	twin booklet	Conners item 9, forgetful (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon101/2	item	twin booklet	Conners item 10, trouble doing things quietly (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon111/2	item	twin booklet	Conners item 11, fidget or squirm (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon121/2	item	twin booklet	Conners item 12, leave my seat (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon131/2	item	twin booklet	Conners item 13, restless or overactive (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon141/2	item	twin booklet	Conners item 14, always on the go (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon151/2	item	twin booklet	Conners item 15, talk too much (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon161/2	item	twin booklet	Conners item 16, give answers prematurely (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon171/2	item	twin booklet	Conners item 17, trouble waiting in line (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
nccon181/2	item	twin booklet	Conners item 18, interrupt others (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
ncconhit1/2	derived	twin booklet	Conners Hyperactivity-Impulsivity scale at 14 (child), 0-27	decimal	scale value	0 to 27
ncconint1/2	derived	twin booklet	Conners Inattention scale at 14 (child), 0-27	decimal	scale value	0 to 27
ncconnt1/2	derived	twin booklet	Conners total scale at 14 (child), 0-54	decimal	scale value	0 to 54
nccooth1/2	item	twin booklet	Hope to follow Other courses (child qnr at 14), see value labels	integer	nominal	1=postgraduate degree, 2=overseas qualification, 3=specified career but not qualification
nccovoc1/2	item	twin booklet	Hope to follow Vocational courses (child qnr at 14), 1Y 0N	integer	nominal	0=no, 1=yes
ncdis11/2	item	twin booklet	Discipline item 1, smacked (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdis21/2	item	twin booklet	Discipline item 2, shouted (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdis31/2	item	twin booklet	Discipline item 3, explains (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdis41/2	item	twin booklet	Discipline item 4, firm (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdis51/2	item	twin booklet	Discipline item 5, joke (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdis61/2	item	twin booklet	Discipline item 6, asks someone else (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncdisavot1/2	derived	twin booklet	Avoidance Parental Discipline scale at 14 (child), 0-4	decimal	scale value	0 to 4
ncdisnegt1/2	derived	twin booklet	Negative Parental Discipline scale at 14 (child), 0-4	decimal	scale value	0 to 4
ncdispost1/2	derived	twin booklet	Positive Parental Discipline scale at 14 (child), 0-4	decimal	scale value	0 to 4
ncedpa11/2	item	twin booklet	Parents think a good education is important (child qnr at 14), see value labels	integer	ordinal	1=not true or quite true, 2=very true
ncedpa21/2	item	twin booklet	Parents think doing my best is important (child qnr at 14), see value labels	integer	ordinal	1=not true or quite true, 2=very true
ncedpa31/2	item	twin booklet	Parents are interested in school marks (child qnr at 14), see value labels	integer	ordinal	1=not true or quite true, 2=very true
nceng011/2	item	twin booklet	English Education item 1: Questions with more than one answer (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng021/2	item	twin booklet	English Education item 2: Asks for reasons for answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng031/2	item	twin booklet	English Education item 3: Encourages questions (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng041/2	item	twin booklet	English Education item 4: Learn from classmates (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng051/2	item	twin booklet	English Education item 5: Use info to support answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng061/2	item	twin booklet	English Education item 6: Get away with easy work (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng071/2	item	twin booklet	English Education item 7: Makes me really think (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng081/2	item	twin booklet	English Education item 8: Friends talk outside of class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng091/2	item	twin booklet	English Education item 9: Friends discuss things learned (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng101/2	item	twin booklet	English Education item 10: Friends enjoy activities outside class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nceng111/2	item	twin booklet	English Education item 11: Friends are interested (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncg1/2	derived	twin web	G composite scale from child web tests at 14, standardised	decimal	scale value	standardised with mean 0 and standard deviation 1
nchtcm1/2	item	twin booklet	Twin Height (Child Qnr at 14), cm	integer	quantitative	130 to 200 (centimetres)
ncipf011/2	item	twin booklet	Important People - Friend item 1: Makes me feel good about ideas (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf021/2	item	twin booklet	Important People - Friend item 2: Make each other feel important (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf031/2	item	twin booklet	Important People - Friend item 3: Sticks up for me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf041/2	item	twin booklet	Important People - Friend item 4: Cares about my feelings (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf051/2	item	twin booklet	Important People - Friend item 5: Listens to me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf061/2	item	twin booklet	Important People - Friend item 6: Does not tell secrets (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf071/2	item	twin booklet	Important People - Friend item 7: Keep promises (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf081/2	item	twin booklet	Important People - Friend item 8: Tell each other problems (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf091/2	item	twin booklet	Important People - Friend item 9: Talk about sad things (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipf101/2	item	twin booklet	Important People - Friend item 10: Talk when angry (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp011/2	item	twin booklet	Important People - Parent item 1: Makes me feel good about ideas (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp021/2	item	twin booklet	Important People - Parent item 2: Make each other feel important (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp031/2	item	twin booklet	Important People - Parent item 3: Sticks up for me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp041/2	item	twin booklet	Important People - Parent item 4: Cares about my feelings (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp051/2	item	twin booklet	Important People - Parent item 5: Listens to me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp061/2	item	twin booklet	Important People - Parent item 6: Does not tell secrets (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp071/2	item	twin booklet	Important People - Parent item 7: Keep promises (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp081/2	item	twin booklet	Important People - Parent item 8: Tell each other problems (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp091/2	item	twin booklet	Important People - Parent item 9: Talk about sad things (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipp101/2	item	twin booklet	Important People - Parent item 10: Talk when angry (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt011/2	item	twin booklet	Important People - Twin item 1: Makes me feel good about ideas (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt021/2	item	twin booklet	Important People - Twin item 2: Make each other feel important (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt031/2	item	twin booklet	Important People - Twin item 3: Sticks up for me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt041/2	item	twin booklet	Important People - Twin item 4: Cares about my feelings (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt051/2	item	twin booklet	Important People - Twin item 5: Listens to me (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt061/2	item	twin booklet	Important People - Twin item 6: Does not tell secrets (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt071/2	item	twin booklet	Important People - Twin item 7: Keep promises (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt081/2	item	twin booklet	Important People - Twin item 8: Tell each other problems (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt091/2	item	twin booklet	Important People - Twin item 9: Talk about sad things (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncipt101/2	item	twin booklet	Important People - Twin item 10: Talk when angry (child qnr at 14), see value labels	integer	ordinal	0=not at all true, 1=a little true, 2=somewhat true, 3=pretty true, 4=really true
ncmat011/2	item	twin booklet	Maths Education item 1: Questions with more than one answer (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat021/2	item	twin booklet	Maths Education item 2: Asks for reasons for answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat031/2	item	twin booklet	Maths Education item 3: Encourages questions (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat041/2	item	twin booklet	Maths Education item 4: Learn from classmates (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat051/2	item	twin booklet	Maths Education item 5: Use info to support answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat061/2	item	twin booklet	Maths Education item 6: Talk about solving problems (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat071/2	item	twin booklet	Maths Education item 7: Get away with easy work (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat081/2	item	twin booklet	Maths Education item 8: Makes me really think (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat091/2	item	twin booklet	Maths Education item 9: Friends talk outside of class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat101/2	item	twin booklet	Maths Education item 10: Friends discuss things learned (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat111/2	item	twin booklet	Maths Education item 11: Friends enjoy activities outside class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncmat121/2	item	twin booklet	Maths Education item 12: Friends are interested (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncpar11/2	item	twin booklet	Parental Feelings item 1, impatient (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar21/2	item	twin booklet	Parental Feelings item 2, happy (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar31/2	item	twin booklet	Parental Feelings item 3, funny (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar41/2	item	twin booklet	Parental Feelings item 4, leave alone (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar51/2	item	twin booklet	Parental Feelings item 5, angry (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar61/2	item	twin booklet	Parental Feelings item 6, close (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncpar71/2	item	twin booklet	Parental Feelings item 7, frustrated (Child Qnr at 14), see value labels	integer	ordinal	0=not true, 1=quite true, 2=very true
ncparnegt1/2	derived	twin booklet	Negative Parental Feelings scale at 14 (child), 0-8	decimal	scale value	0 to 8
ncparpost1/2	derived	twin booklet	Positive Parental Feelings scale at 14 (child), 0-6	decimal	scale value	0 to 6
ncpart1/2	derived	twin booklet	Total Parental Feelings scale at 14 (child), 0-14	decimal	scale value	0 to 14
ncpub11/2	item	twin booklet	Puberty item 1, growth spurt (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncpub21/2	item	twin booklet	Puberty item 2, body hair (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncpub31/2	item	twin booklet	Puberty item 3, skin change (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncpub41/2	item	twin booklet	Puberty item 4, breasts (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncpub51/2	item	twin booklet	Puberty item 5, menstruate (Child Qnr at 14), 1yes 0no	integer	nominal	0=no, 1=yes
ncpub5age1/2	derived	twin booklet	Age in years at first period (Child Qnr at 14), see value labels	integer	ordinal	9=9 or less, 10, 11, 12, 13, 14 (years)
ncpub61/2	item	twin booklet	Puberty item 6, voice deepen (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncpub71/2	item	twin booklet	Puberty item 7, hair on face (Child Qnr at 14), see value labels	integer	ordinal	0=not yet begun, 1=barely begun, 2=definitely begun, 3=completed
ncqage1/2	derived	admin	Age of twin when child questionnaire returned at 14, years	decimal	quantitative	approx. 12.7 to 15.5 (years)
ncqdata1/2	item	twin booklet	Twin booklet data provided by child at 14, 1Y 0N	integer	nominal	0=no, 1=yes
ncqLLCage1	derived	admin	Age of twin when 14 year child questionnaire returned (for use in LLC TRE), months	integer	quantitative	approx. 154 to 184 (months)
ncqLLCdate1	derived	admin	Date when 14 year child questionnaire returned (for use in LLC TRE), yyyy-mm string	string	date value	approx. '2007-11' to '2010-08'
ncqweb1/2	item	twin booklet	Twin booklet returned on line at 14, 1Y (web) 0N (paper)	integer	nominal	0=no, 1=yes
ncsci011/2	item	twin booklet	Science Education item 1: Questions with more than one answer (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci021/2	item	twin booklet	Science Education item 2: Asks for reasons for answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci031/2	item	twin booklet	Science Education item 3: Encourages questions (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci041/2	item	twin booklet	Science Education item 4: Learn from classmates (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci051/2	item	twin booklet	Science Education item 5: Use info to support answers (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci061/2	item	twin booklet	Science Education item 6: Talk about solving problems (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci071/2	item	twin booklet	Science Education item 7: Get away with easy work (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci081/2	item	twin booklet	Science Education item 8: Makes me really think (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci091/2	item	twin booklet	Science Education item 9: Friends talk outside of class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci101/2	item	twin booklet	Science Education item 10: Friends discuss things learned (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci111/2	item	twin booklet	Science Education item 11: Friends enjoy activities outside class (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
ncsci121/2	item	twin booklet	Science Education item 12: Friends are interested (child qnr at 14), see value labels	integer	ordinal	0=almost never, 1=seldom, 2=sometimes, 3=often, 4=very often
nctage1/2	derived	admin	Age of twin when telephone language test data returned at 14, years	decimal	quantitative	approx. 13.8 to 14.8 years
ncvic011/2	item	twin booklet	Victim item 1, punched me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic021/2	item	twin booklet	Victim item 2, get me into trouble (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic031/2	item	twin booklet	Victim item 3, called me names (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic041/2	item	twin booklet	Victim item 4, took something without permission (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic051/2	item	twin booklet	Victim item 5, kicked me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic061/2	item	twin booklet	Victim item 6, turn friends against me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic071/2	item	twin booklet	Victim item 7, made fun of appearance (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic081/2	item	twin booklet	Victim item 8, tried to break something (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic091/2	item	twin booklet	Victim item 9, hurt me physically (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic101/2	item	twin booklet	Victim item 10, refused to talk to me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic111/2	item	twin booklet	Victim item 11, made fun of me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic121/2	item	twin booklet	Victim item 12, stole something (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic131/2	item	twin booklet	Victim item 13, beat me up (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic141/2	item	twin booklet	Victim item 14, made others not talk to me (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic151/2	item	twin booklet	Victim item 15, swore at me(Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvic161/2	item	twin booklet	Victim item 16, damaged some property (Child Qnr at 14), see value labels	integer	ordinal	0=not at all, 1=once, 2=more than once
ncvicph1/2	derived	twin booklet	Victimization Physical scale at 14 (child), 0-8	decimal	scale value	0 to 8
ncvicpr1/2	derived	twin booklet	Victimization Property scale at 14 (child), 0-8	decimal	scale value	0 to 8
ncvicso1/2	derived	twin booklet	Victimization Social Manipulation scale at 14 (child), 0-8	decimal	scale value	0 to 8
ncvicve1/2	derived	twin booklet	Victimization Verbal scale at 14 (child), 0-8	decimal	scale value	0 to 8
ncwage1/2	derived	twin web	Age of twin when web tests started at 14, years	decimal	quantitative	approx. 13.2 to 14.7 years
ncwcons	item	twin web	Parent gave on line consent (14 year web), 1Y 0N	integer	nominal	0=no, 1=yes
ncwdata1/2	derived	twin web	Twin web data available (at least one test) at 14, 1Y 0N	integer	nominal	0=no, 1=yes
ncwLLCage1	derived	twin web	Age of twin when 14 year twin web tests started (for use in LLC TRE), months	integer	quantitative	approx. 154 to 184 (months)
ncwLLCdate1	derived	twin web	Date when 14 year twin web tests started (for use in LLC TRE), yyyy-mm string	string	date value	approx. '2007-11' to '2010-06'
ncwsess1/2	item	twin web	Number of sessions used during web battery (14 year web)	integer	quantitative	approx. 1 to 12
ncwstat1/2	item	twin web	Web battery status (14 year web), see value labels	integer	nominal	0=not started, 1=started but not finished, 2=finished
ncwtkg1/2	item	twin booklet	Twin Weight (Child Qnr at 14), kg	integer	quantitative	30 to 90 (kilograms)
npap03r1/2	item	parent booklet	Reversed version of parent APSD item 3 (parent at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
npap07r1/2	item	parent booklet	Reversed version of parent APSD item 7 (parent at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
npap12r1/2	item	parent booklet	Reversed version of parent APSD item 12 (parent at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
npap18r1/2	item	parent booklet	Reversed version of parent APSD item 18 (parent at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
npap20r1/2	item	parent booklet	Reversed version of parent APSD item 20 (parent at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
npaps011/2	item	parent booklet	APSD item 1, blames others (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps021/2	item	parent booklet	APSD item 2, illegal activities (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps031/2	item	parent booklet	APSD item 3, concerned about school (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps041/2	item	parent booklet	APSD item 4, acts without thinking (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps051/2	item	parent booklet	APSD item 5, emotions seem shallow (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps061/2	item	parent booklet	APSD item 6, lies easily (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps071/2	item	parent booklet	APSD item 7, good at keeping promises (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps081/2	item	parent booklet	APSD item 8, brags excessively (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps091/2	item	parent booklet	APSD item 9, gets bored easily (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps101/2	item	parent booklet	APSD item 10, uses or cons other people (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps111/2	item	parent booklet	APSD item 11, teases (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps121/2	item	parent booklet	APSD item 12, feels bad or guilty (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps131/2	item	parent booklet	APSD item 13, dangerous activities (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps141/2	item	parent booklet	APSD item 14, can be charming (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps151/2	item	parent booklet	APSD item 15, becomes angry (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps161/2	item	parent booklet	APSD item 16, better than other people (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps171/2	item	parent booklet	APSD item 17, does not plan ahead (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps181/2	item	parent booklet	APSD item 18, concerned about feelings (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps191/2	item	parent booklet	APSD item 19, does not show feelings (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npaps201/2	item	parent booklet	APSD item 20, keeps same friends (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npapsdt1/2	derived	parent booklet	APSD total scale at 14 (parent), 0-40	decimal	scale value	0 to 40
npaq011/2	item	parent booklet	AQ item 1, prefers to do things with others (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq01r1/2	item	parent booklet	Reversed version of parent AQ item 1 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq021/2	item	parent booklet	AQ item 2, prefers to do things the same way (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq031/2	item	parent booklet	AQ item 3, finds it easy to create a picture (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq03r1/2	item	parent booklet	Reversed version of parent AQ item 3 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq041/2	item	parent booklet	AQ item 4, gets so strongly absorbed (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq051/2	item	parent booklet	AQ item 5, notices small sounds (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq061/2	item	parent booklet	AQ item 6, notices car number plates (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq071/2	item	parent booklet	AQ item 7, impolite even though thinks polite (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq081/2	item	parent booklet	AQ item 8, can imagine characters in story (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq08r1/2	item	parent booklet	Reversed version of parent AQ item 8 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq091/2	item	parent booklet	AQ item 9, fascinated by dates (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq101/2	item	parent booklet	AQ item 10, keep track of several conversations (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq10r1/2	item	parent booklet	Reversed version of parent AQ item 10 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq111/2	item	parent booklet	AQ item 11, finds social situations easy (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq11r1/2	item	parent booklet	Reversed version of parent AQ item 11 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq121/2	item	parent booklet	AQ item 12, tends to notice details (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq131/2	item	parent booklet	AQ item 13, rather go to a library (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq141/2	item	parent booklet	AQ item 14, drawn more strongly to people (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq14r1/2	item	parent booklet	Reversed version of parent AQ item 14 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq151/2	item	parent booklet	AQ item 15, tends to have very strong interests (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq161/2	item	parent booklet	AQ item 16, not easy for others to get a word in (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq171/2	item	parent booklet	AQ item 17, fascinated by numbers (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq181/2	item	parent booklet	AQ item 18, cannot work out characters intentions (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq191/2	item	parent booklet	AQ item 19, does not enjoy reading fiction (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq201/2	item	parent booklet	AQ item 20, finds it hard to make friends (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq211/2	item	parent booklet	AQ item 21, notices patterns in things (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq221/2	item	parent booklet	AQ item 22, not upset if routine disturbed (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq22r1/2	item	parent booklet	Reversed version of parent AQ item 22 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq231/2	item	parent booklet	AQ item 23, cannot keep conversation going (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq241/2	item	parent booklet	AQ item 24, can read between the lines (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq24r1/2	item	parent booklet	Reversed version of parent AQ item 24 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq251/2	item	parent booklet	AQ item 25, concentrates on the whole picture (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq25r1/2	item	parent booklet	Reversed version of parent AQ item 25 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq261/2	item	parent booklet	AQ item 26, does not notice small changes (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq26r1/2	item	parent booklet	Reversed version of parent AQ item 26 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq271/2	item	parent booklet	AQ item 27, can tell if listener is bored (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq27r1/2	item	parent booklet	Reversed version of parent AQ item 27 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq281/2	item	parent booklet	AQ item 28, enjoys doing things spontaneously (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq28r1/2	item	parent booklet	Reversed version of parent AQ item 28 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq291/2	item	parent booklet	AQ item 29, often last to understand joke (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq301/2	item	parent booklet	AQ item 30, can work out what someone is thinking (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq30r1/2	item	parent booklet	Reversed version of parent AQ item 30 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq311/2	item	parent booklet	AQ item 31, keeps going on and on (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq321/2	item	parent booklet	AQ item 32, likes to collect info about categories (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq331/2	item	parent booklet	AQ item 33, finds it difficult to imagine (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq341/2	item	parent booklet	AQ item 34, cannot work out peoples intentions (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq351/2	item	parent booklet	AQ item 35, anxious in new situations (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq361/2	item	parent booklet	AQ item 36, enjoys meeting new people (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq36r1/2	item	parent booklet	Reversed version of parent AQ item 36 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq371/2	item	parent booklet	AQ item 37, not good at remembering birth dates (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq37r1/2	item	parent booklet	Reversed version of parent AQ item 37 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaq381/2	item	parent booklet	AQ item 38, finds it easy to play pretending (parent at 14), see value labels	integer	ordinal	0=definitely disagree, 1=slightly disagree, 2=slightly agree, 3=definitely agree
npaq38r1/2	item	parent booklet	Reversed version of parent AQ item 38 (parent at 14), see value labels	integer	ordinal	0=definitely agree, 1=slightly agree, 2=slightly disagree, 3=definitely disagree
npaqt1/2	derived	parent booklet	AQ total scale at 14 (parent), 0-114	decimal	scale value	0 to 114
npcalt1/2	derived	parent booklet	APSD Callous-Unemotional scale at 14 (parent), 0-12	decimal	scale value	0 to 12
npcha1x	item	parent booklet	Chaos item 1, regular routine first thing (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npcha1xr	item	parent booklet	Reversed version of parent Chaos item 1 (parent at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
npcha2x	item	parent booklet	Chaos item 2, cannot hear yourself think (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npcha3x	item	parent booklet	Chaos item 3, stay on top (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npcha3xr	item	parent booklet	Reversed version of parent Chaos item 3 (parent at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
npcha4x	item	parent booklet	Chaos item 4, television turned on (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npcha5x	item	parent booklet	Chaos item 5, calm (parent at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
npcha5xr	item	parent booklet	Reversed version of parent Chaos item 5 (parent at 14), see value labels	integer	ordinal	2=not true, 1=quite true, 0=very true
npchatot	derived	parent booklet	Chaos at home total scale at 14 (parent), 0-10	decimal	scale value	0 to 10
npcon011/2	item	parent booklet	Conners item 1, always on the go (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon021/2	item	parent booklet	Conners item 2, sustained mental effort (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon031/2	item	parent booklet	Conners item 3, sustaining attention (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon041/2	item	parent booklet	Conners item 4, does not seem to listen (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon051/2	item	parent booklet	Conners item 5, runs about or climbs (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon061/2	item	parent booklet	Conners item 6, does not follow through (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon071/2	item	parent booklet	Conners item 7, difficulty organising (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon081/2	item	parent booklet	Conners item 8, talks excessively (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon091/2	item	parent booklet	Conners item 9, fails to give close attention (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon101/2	item	parent booklet	Conners item 10, waiting in lines (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon111/2	item	parent booklet	Conners item 11, interrupts or intrudes (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon121/2	item	parent booklet	Conners item 12, forgetful in daily activities (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon131/2	item	parent booklet	Conners item 13, fidgets with hands (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon141/2	item	parent booklet	Conners item 14, difficulty playing (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon151/2	item	parent booklet	Conners item 15, loses things (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon161/2	item	parent booklet	Conners item 16, leaves seat (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon171/2	item	parent booklet	Conners item 17, easily distracted (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npcon181/2	item	parent booklet	Conners item 18, blurts out answers (parent at 14), see value labels	integer	ordinal	0=not at all true, 1=just a little bit true, 2=pretty much true, 3=very much true
npconhit1/2	derived	parent booklet	Conners Hyperactivity-Impulsivity scale at 14 (parent), 0-27	decimal	scale value	0 to 27
npconint1/2	derived	parent booklet	Conners Inattention scale at 14 (parent), 0-27	decimal	scale value	0 to 27
npconnt1/2	derived	parent booklet	Conners total scale at 14 (parent), 0-54	decimal	scale value	0 to 54
npdis011/2	item	parent booklet	Discipline item 1, smack (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdis021/2	item	parent booklet	Discipline item 2, shout (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdis031/2	item	parent booklet	Discipline item 3, explain (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdis041/2	item	parent booklet	Discipline item 4, firm (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdis051/2	item	parent booklet	Discipline item 5, joke (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdis061/2	item	parent booklet	Discipline item 6, ask someone else (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npdisavot1/2	derived	parent booklet	Avoidance Parental Discipline scale at 14 (parent), 0-4	decimal	scale value	0 to 4
npdisnegt1/2	derived	parent booklet	Negative Parental Discipline scale at 14 (parent), 0-4	decimal	scale value	0 to 4
npdispost1/2	derived	parent booklet	Positive Parental Discipline scale at 14 (parent), 0-4	decimal	scale value	0 to 4
npimpt1/2	derived	parent booklet	APSD Impulsivity scale at 14 (parent), 0-10	decimal	scale value	0 to 10
npks3t2a1/2	derived	slq qnr	End of KS3 2-subject Academic achievement mean level (from parent SLQ), 1-9	decimal	scale value	1 to 9 (NC levels)
npks3t3a1/2	derived	slq qnr	End of KS3 3-subject Academic achievement meal level (from parent SLQ), 1-9	decimal	scale value	1 to 9 (NC levels)
npks3tall1/2	derived	slq qnr	End of KS3 all-subject Academic achievement mean level (from parent SLQ), 1-9	decimal	scale value	1 to 9 (NC levels)
npnart1/2	derived	parent booklet	APSD Narcissism scale at 14 (parent), 0-14	decimal	scale value	0 to 14
nppar011/2	item	parent booklet	Parental Feelings item 1, impatient (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar021/2	item	parent booklet	Parental Feelings item 2, happy (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar031/2	item	parent booklet	Parental Feelings item 3, amused (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar041/2	item	parent booklet	Parental Feelings item 4, leave alone (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar051/2	item	parent booklet	Parental Feelings item 5, angry (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar061/2	item	parent booklet	Parental Feelings item 6, close (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
nppar071/2	item	parent booklet	Parental Feelings item 7, frustrated (parent at 14), see value labels	integer	ordinal	0=rarely or never, 1=sometimes, 2=often
npparnegt1/2	derived	parent booklet	Negative Parental Feelings scale at 14 (parent), 0-8	decimal	scale value	0 to 8
npparpost1/2	derived	parent booklet	Positive Parental Feelings scale at 14 (parent), 0-6	decimal	scale value	0 to 6
nppart1/2	derived	parent booklet	Total Parental Feelings scale at 14 (parent), 0-14	decimal	scale value	0 to 14
npqage	derived	admin	Age of twin when parent questionnaire returned at 14, years	decimal	quantitative	approx. 12.7 to 15.5 years
npqdata	item	parent booklet	Parent booklet data exists at 14, 1Y 0N	integer	nominal	0=no, 1=yes
npqLLCage	derived	admin	Age of twin when 14 year parent questionnaire returned (for use in LLC TRE), months	integer	quantitative	approx. 154 to 184 (months)
npqLLCdate	derived	admin	Date when 14 year parent questionnaire returned (for use in LLC TRE), yyyy-mm string	string	date value	approx. '2007-11' to '2010-08'
npqweb	item	parent booklet	Parent booklet returned on line at 14, 1Y (web) 0N (paper)	integer	nominal	0=no, 1=yes
npslage	derived	admin	Age of twin when parent SLQ questionnaire returned at 14, years	decimal	quantitative	approx. 13.9 to 15 years
npslks3age	derived	admin	Approximate age of twin when end-of-KS3 teacher assessment was made at 14, years	decimal	quantitative	approx. 13.8 to 14.8 years
npslks3LLCage	derived	admin	Estimated age of twin when end-of-KS3 teacher assessment was made at 14 (for use in LLC TRE), months	integer	quantitative	approx. 166 to 177 (months)
npslks3LLCdate	derived	admin	Estimated date when end-of-KS3 teacher assessment was made at 14 (for use in LLC TRE), yyyy-mm string	string	date value	'2008-06' to '2011-06'
npslLLCage	derived	admin	Age of twin when 14 year parent SLQ questionnaire returned (for use in LLC TRE), months	integer	quantitative	approx. 167 to 183 (months)
npslLLCdate	derived	admin	Date when 14 year parent SLQ questionnaire returned (for use in LLC TRE), yyyy-mm string	string	date value	'2008-07' to '2011-10'
npubtot1/2	derived	twin booklet	Twin pubertal scale (child qnr at 14), 1 to 4	decimal	scale value	1 to 4
npvic011/2	item	parent booklet	Victim item 1, punched them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic021/2	item	parent booklet	Victim item 2, get them into trouble (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic031/2	item	parent booklet	Victim item 3, called them names (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic041/2	item	parent booklet	Victim item 4, took something without permission (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic051/2	item	parent booklet	Victim item 5, kicked them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic061/2	item	parent booklet	Victim item 6, turn friends against them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic071/2	item	parent booklet	Victim item 7, made fun of appearance (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic081/2	item	parent booklet	Victim item 8, tried to break something (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic091/2	item	parent booklet	Victim item 9, hurt them physically (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic101/2	item	parent booklet	Victim item 10, refused to talk to them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic111/2	item	parent booklet	Victim item 11, made fun of them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic121/2	item	parent booklet	Victim item 12, stole something (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic131/2	item	parent booklet	Victim item 13, beat them up (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic141/2	item	parent booklet	Victim item 14, made others not talk to them (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic151/2	item	parent booklet	Victim item 15, swore at them(parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvic161/2	item	parent booklet	Victim item 16, damaged some property (parent at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
npvicph1/2	derived	parent booklet	Victimization Physical scale at 14 (parent), 0-8	decimal	scale value	0 to 8
npvicpr1/2	derived	parent booklet	Victimization Property scale at 14 (parent), 0-8	decimal	scale value	0 to 8
npvicso1/2	derived	parent booklet	Victimization Social Manipulation scale at 14 (parent), 0-8	decimal	scale value	0 to 8
npvicve1/2	derived	parent booklet	Victimization Verbal scale at 14 (parent), 0-8	decimal	scale value	0 to 8
nrvatm1/2	derived	twin web	Mean item answer time for Ravens test at 14 (seconds)	decimal	quantitative	approx. 0-80 seconds
nrvdata1/2	item	twin web	Ravens web test data available at 14, 1Y 0N	integer	nominal	0=no, 1=yes
nrvsess1/2	item	twin web	Number of sessions to complete Ravens web test at 14	integer	quantitative	approx. 1-5 sessions
nrvstat1/2	item	twin web	Ravens web test status (14 year web), see value labels	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=completed but compromised by loss of data, 4=completed but compromised by random responding
nrvtime1/2	item	twin web	Time taken to complete Ravens web test at 14 (seconds)	integer	quantitative	approx. 0-3000 seconds
nrvtot1/2	item	twin web	Total score for Ravens web test at 14 (0-30)	integer	scale value	0 to 30
nrvtota1/2	derived	twin web	Adjusted total score for Ravens web test at 14 (0-30)	decimal	scale value	0 to 30
nrXYYan1/2 (X is the sub-test C/D/E/F, YY is the item number 01-12)	item	twin web	Raven category X item YY answer selected (14yr twin web), see value labels	integer	nominal	1 to 8 (answer selected) or -1=timed out, -2=discontinued, -4=crashed
nrXYYsc1/2 (X is the sub-test C/D/E/F, YY is the item number 01-12)	item	twin web	Raven category X item YY score (14yr twin web), 1right 0wrong	integer	ordinal	0=incorrect, 1=correct
nsamesch	item	admin	Twins attending the same school at age 14, 1Y 0N	integer	nominal	0=no, 1=yes
nsametch	item	admin	Twins taught by the same teacher at age 14, 1Y 0N	integer	nominal	0=no, 1=yes
nscatm1/2	derived	twin web	Mean item answer time for Science test at 14 (seconds)	decimal	quantitative	approx. 0-80 seconds
nscdata1/2	item	twin web	Science web test data available at 14, 1Y 0N	integer	nominal	0=no, 1=yes
nschtp1/2	item	admin	School type at age 14 (cohort 1 only), see value labels	integer	nominal	0=unknown, 1=state (non fee paying), 2=private (fee paying)
nscsess1/2	item	twin web	Number of sessions to complete Science web test at 14	integer	quantitative	approx. 1-6 sessions
nscstat1/2	item	twin web	Science web test status (14 year web), see value labels	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=completed but compromised by loss of data, 4=completed but compromised by random responding
nsctime1/2	item	twin web	Time taken to complete Science web test at 14 (seconds)	integer	quantitative	approx. 0-4000 seconds
nsctot1/2	item	twin web	Total score for Science web test at 14 (0-48)	integer	scale value	0 to 48
nsctota1/2	derived	twin web	Adjusted total score for Science web test at 14 (0-48)	decimal	scale value	0 to 48
nscXXYan1/2 (XX is the item number 01-24, Y is the item part A/B/C/D if applicable)	item	twin web	Science item XXY answer selected (14yr twin web), see value labels	integer or string	nominal	1-7 (answer selected if single clickable response), or numeric input, or string showing multiple inputs; all items have -1=timed out, -2=discontinued, -4=crashed
nscXXYsc1/2 (XX is the item number 01-24, Y is the item part A/B/C/D if applicable)	item	twin web	Science item XXY score (14yr twin web)	integer	ordinal	0=incorrect, 1=correct (most items) or 0/1/2/3/4 (items 6, 10A, 17B)
nslartt1/2	item	slq qnr	Art teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nsldtt1/2	item	slq qnr	DT teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslengs1/2	item	slq qnr	English test (SAT) NC level (SLQ at 14), see value labels	integer	nominal	2=2 or lower, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8
nslengt1/2	item	slq qnr	English teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslgeot1/2	item	slq qnr	Geography teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslhist1/2	item	slq qnr	History teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslhleng1/2	item	slq qnr	English used at home (SLQ at 14), 1Y 0N	integer	nominal	0=no, 1=yes
nslhlengu1/2	item	slq qnr	English: how often used at home (SLQ at 14), see value labels	integer	nominal	1=all or most of the time, 2=half of the time, 3=less than half of the time
nslhl1n1/2	item	slq qnr	Home foreign language 1 (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 7=Asian language
nslhl1u1/2	item	slq qnr	Home foreign language 1 (SLQ at 14): how often used, see value labels	integer	ordinal	1=all or most of the time, 2=half of the time, 3=less than half of the time
nslhl2n1/2	item	slq qnr	Home foreign language 2 (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 7=Asian language
nslhl2u1/2	item	slq qnr	Home foreign language 2 (SLQ at 14): how often used, see value labels	integer	ordinal	1=all or most of the time, 2=half of the time, 3=less than half of the time
nslictt1/2	item	slq qnr	ICT teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslla1n1/2	item	slq qnr	Foreign language 1 teacher assessed (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 9=other
nslla1r1/2	derived	slq qnr	Recoding of language 1 teacher assessed (SLQ at 14), see value labels	integer	nominal	0=not in cohort 1, 1=in cohort 1 but data not useable, 2=in cohort 1 but no language assessed, 3=in cohort 1 with assessed language already recorded, 4=in cohort 1 with assessed language derived
nslla1t1/2	item	slq qnr	Language 1 teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslla2n1/2	item	slq qnr	Foreign language 2 teacher assessed (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 9=other
nslla2t1/2	item	slq qnr	Language 2 teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslls1a1/2	item	slq qnr	Foreign language 1 studied at school (SLQ at 14): age when started (years)	integer	quantitative	4 to 14 (age in years)
nslls1n1/2	derived	slq qnr	Foreign language 1 studied at school (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 7=Asian language, 8=classical language
nslls1u1/2	item	slq qnr	Foreign language 1 studied at school (SLQ at 14): use out of school, see value labels	integer	ordinal	1=often, 2=sometimes, 3=never
nslls2a1/2	item	slq qnr	Foreign language 2 studied at school (SLQ at 14): age when started (years)	integer	quantitative	4 to 14 (age in years)
nslls2n1/2	derived	slq qnr	Foreign language 2 studied at school (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 7=Asian language, 8=classical language
nslls2u1/2	item	slq qnr	Foreign language 2 studied at school (SLQ at 14): use out of school, see value labels	integer	ordinal	1=often, 2=sometimes, 3=never
nslls3a1/2	item	slq qnr	Foreign language 3 studied at school (SLQ at 14): age when started (years)	integer	quantitative	4 to 14 (age in years)
nslls3n1/2	derived	slq qnr	Foreign language 3 studied at school (SLQ at 14), see value labels	integer	nominal	2=Welsh, 3=French, 4=German, 5=Spanish, 6=other modern European, 7=Asian language, 8=classical language
nslls3u1/2	item	slq qnr	Foreign language 3 studied at school (SLQ at 14): use out of school, see value labels	integer	ordinal	1=often, 2=sometimes, 3=never
nsllsenga1/2	item	slq qnr	English studied at school (SLQ at 14): age when started (years)	integer	quantitative	4 to 14 (age in years)
nsllsengu1/2	item	slq qnr	English studied at school (SLQ at 14): use out of school, see value labels	integer	ordinal	1=often, 2=sometimes, 3=never
nslmats1/2	item	slq qnr	Maths test (SAT) NC level (SLQ at 14), see value labels	integer	nominal	2=2 or lower, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8
nslmatt1/2	item	slq qnr	Maths teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslmust1/2	item	slq qnr	Music teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslpet1/2	item	slq qnr	PE teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslqdata	item	slq qnr	Parent SLQ questionnaire data exists at 14, 1Y 0N	integer	nominal	0=no, 1=yes
nslscis1/2	item	slq qnr	Science test (SAT) NC level (SLQ at 14), see value labels	integer	nominal	2=2 or lower, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8
nslscit1/2	item	slq qnr	Science teacher assessment NC level (SLQ at 14), see value labels	integer	nominal	1=1 or lower, 2=2, 3=3, 4=4, 5=5, 6=6, 7=7, 8=8, 9=exceptional performance
nslscla1/2	derived	slq qnr	Main language used at school (SLQ at 14), see value labels	integer	nominal	1=English, 2=Welsh, 3=other
nt2a1/2	derived	teacher qnr	Teacher 2-subject Academic achievement mean level at 14 (cohort 1 only), 3-8	decimal	scale value	3 to 8 (NC levels)
nt3a1/2	derived	teacher qnr	Teacher 3-subject Academic achievement mean level at 14 (cohort 1 only), 3-8	decimal	scale value	3 to 8 (NC levels)
ntap03r1/2	item	teacher qnr	Reversed version of teacher APSD item 3 (teacher at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
ntap07r1/2	item	teacher qnr	Reversed version of teacher APSD item 7 (teacher at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
ntap12r1/2	item	teacher qnr	Reversed version of teacher APSD item 12 (teacher at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
ntap18r1/2	item	teacher qnr	Reversed version of teacher APSD item 18 (teacher at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
ntap20r1/2	item	teacher qnr	Reversed version of teacher APSD item 20 (teacher at 14), see value labels	integer	ordinal	2=not true, 1=somewhat true, 0=certainly true
ntaps011/2	item	teacher qnr	APSD item 1, blames others (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps021/2	item	teacher qnr	APSD item 2, illegal activities (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps031/2	item	teacher qnr	APSD item 3, concerned about school (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps041/2	item	teacher qnr	APSD item 4, acts without thinking (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps051/2	item	teacher qnr	APSD item 5, emotions seem shallow (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps061/2	item	teacher qnr	APSD item 6, lies easily (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps071/2	item	teacher qnr	APSD item 7, good at keeping promises (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps081/2	item	teacher qnr	APSD item 8, brags excessively (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps091/2	item	teacher qnr	APSD item 9, gets bored easily (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps101/2	item	teacher qnr	APSD item 10, uses or cons other people (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps111/2	item	teacher qnr	APSD item 11, teases (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps121/2	item	teacher qnr	APSD item 12, feels bad or guilty (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps131/2	item	teacher qnr	APSD item 13, dangerous activities (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps141/2	item	teacher qnr	APSD item 14, can be charming (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps151/2	item	teacher qnr	APSD item 15, becomes angry (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps161/2	item	teacher qnr	APSD item 16, better than other people (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps171/2	item	teacher qnr	APSD item 17, does not plan ahead (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps181/2	item	teacher qnr	APSD item 18, concerned about feelings (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps191/2	item	teacher qnr	APSD item 19, does not show feelings (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntaps201/2	item	teacher qnr	APSD item 20, keeps same friends (teacher at 14), see value labels	integer	ordinal	0=not true, 1=somewhat true, 2=certainly true
ntapsdt1/2	derived	teacher qnr	APSD total scale at 14 (teacher), 0-40	decimal	scale value	0 to 40
ntcalt1/2	derived	teacher qnr	APSD Callous-Unemotional scale at 14 (teacher), 0-12	decimal	scale value	0 to 12
ntclsiz1/2	item	teacher qnr	Average class size at school (teacher at 14), see value labels	integer	ordinal	1=1-20, 2=21-25, 3=26-30, 4=30+
ntcon011/2	item	teacher qnr	Conners item 1, always on the go (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon021/2	item	teacher qnr	Conners item 2, sustained mental effort (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon031/2	item	teacher qnr	Conners item 3, sustaining attention (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon041/2	item	teacher qnr	Conners item 4, does not seem to listen (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon051/2	item	teacher qnr	Conners item 5, runs about or climbs (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon061/2	item	teacher qnr	Conners item 6, does not follow through (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon071/2	item	teacher qnr	Conners item 7, difficulty organising (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon081/2	item	teacher qnr	Conners item 8, talks excessively (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon091/2	item	teacher qnr	Conners item 9, fails to give close attention (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon101/2	item	teacher qnr	Conners item 10, waiting in lines (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon111/2	item	teacher qnr	Conners item 11, interrupts or intrudes (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon121/2	item	teacher qnr	Conners item 12, forgetful in daily activities (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon131/2	item	teacher qnr	Conners item 13, fidgets with hands (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon141/2	item	teacher qnr	Conners item 14, difficulty playing (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon151/2	item	teacher qnr	Conners item 15, loses things (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon161/2	item	teacher qnr	Conners item 16, leaves seat (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon171/2	item	teacher qnr	Conners item 17, easily distracted (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntcon181/2	item	teacher qnr	Conners item 18, blurts out answers (teacher at 14), see value labels	integer	ordinal	0=not true at all, 1=just a little bit true, 2=pretty much true, 3=very much true
ntconhit1/2	derived	teacher qnr	Conners Hyperactivity-Impulsivity scale at 14 (teacher), 0-27	decimal	scale value	0 to 27
ntconint1/2	derived	teacher qnr	Conners Inattention scale at 14 (teacher), 0-27	decimal	scale value	0 to 27
ntconnt1/2	derived	teacher qnr	Conners total scale at 14 (teacher), 0-54	decimal	scale value	0 to 54
nteng1/2	item	teacher qnr	English NC level (teacher reported at 14), see value labels	integer	ordinal	3=3 or lower, 4=4, 5=5, 6=6, 7=7, 8=8 or higher
ntenset1/2	item	teacher qnr	English class setting at school (teacher at 14), 1Y 0N	integer	nominal	0=no, 1=yes
ntimpt1/2	derived	teacher qnr	APSD Impulsivity scale at 14 (teacher), 0-10	decimal	scale value	0 to 10
ntla11/2	item	teacher qnr	Language 1 NC level (teacher reported at 14), see value labels	integer	ordinal	3=3 or lower, 4=4, 5=5, 6=6, 7=7, 8=8 or higher
ntla21/2	item	teacher qnr	Language 2 NC level (teacher reported at 14), see value labels	integer	ordinal	3=3 or lower, 4=4, 5=5, 6=6, 7=7, 8=8 or higher
ntlang11/2	item	teacher qnr	Foreign Language 1 taught (teacher at 14), see value labels	integer	nominal	1=French, 2=German, 3=Spanish, 9=other foreign language
ntlang21/2	item	teacher qnr	Foreign Language 2 taught (teacher at 14), see value labels	integer	nominal	1=French, 2=German, 3=Spanish, 9=other foreign language
ntmaset1/2	item	teacher qnr	Mathematics class setting at school (teacher at 14), 1Y 0N	integer	nominal	0=no, 1=yes
ntmat1/2	item	teacher qnr	Maths NC level (teacher reported at 14), see value labels	integer	ordinal	3=3 or lower, 4=4, 5=5, 6=6, 7=7, 8=8 or higher
ntnart1/2	derived	teacher qnr	APSD Narcissism scale at 14 (teacher), 0-14	decimal	scale value	0 to 14
ntottm1/2	derived	twin web	Total web test time for entire battery, if finished (minutes)	decimal	quantitative	approx. 0-150 minutes
ntqage1/2	derived	admin	Age of twin when teacher questionnaire returned at 14, years	decimal	quantitative	approx. 13.5 to 14.7 years
ntqdata1/2	item	teacher qnr	Teacher questionnaire data exists at 14 (cohort 1 only), 1Y 0N	integer	nominal	0=no, 1=yes
ntqLLCage1	derived	admin	Age of twin when 14 year teacher questionnaire returned (for use in LLC TRE), months	integer	quantitative	approx. 163 to 174 (months)
ntqLLCdate1	derived	admin	Date when 14 year teacher questionnaire returned (for use in LLC TRE), yyyy-mm string	string	date value	approx. '2008-03' to '2008-08'
ntschtp1/2	item	teacher qnr	Type of school (teacher at 14), 1=non fee paying 2=fee paying	integer	nominal	1=non fee paying, 2=fee paying
ntsci1/2	item	teacher qnr	Science NC level (teacher reported at 14), see value labels	integer	ordinal	3=3 or lower, 4=4, 5=5, 6=6, 7=7, 8=8 or higher
ntscset1/2	item	teacher qnr	Science class setting at school (teacher at 14), 1Y 0N	integer	nominal	0=no, 1=yes
ntsen1/2	item	teacher qnr	Statement of SEN (teacher at 12), 1yes 0no	integer	nominal	0=no, 1=yes
ntsenrg1/2	item	teacher qnr	On the SEN register (teacher at 14), 1yes 0no	integer	nominal	0=no, 1=yes
ntvic011/2	item	teacher qnr	Victim item 1, punched them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic021/2	item	teacher qnr	Victim item 2, get them into trouble (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic031/2	item	teacher qnr	Victim item 3, called them names (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic041/2	item	teacher qnr	Victim item 4, took something without permission (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic051/2	item	teacher qnr	Victim item 5, kicked them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic061/2	item	teacher qnr	Victim item 6, turn friends against them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic071/2	item	teacher qnr	Victim item 7, made fun of appearance (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic081/2	item	teacher qnr	Victim item 8, tried to break something (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic091/2	item	teacher qnr	Victim item 9, hurt them physically (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic101/2	item	teacher qnr	Victim item 10, refused to talk to them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic111/2	item	teacher qnr	Victim item 11, made fun of them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic121/2	item	teacher qnr	Victim item 12, stole something (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic131/2	item	teacher qnr	Victim item 13, beat them up (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic141/2	item	teacher qnr	Victim item 14, made others not talk to them (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic151/2	item	teacher qnr	Victim item 15, swore at them(teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvic161/2	item	teacher qnr	Victim item 16, damaged some property (teacher at 14), see value labels	integer	nominal	0=not at all, 1=once, 2=more than once
ntvicph1/2	derived	teacher qnr	Victimization Physical scale at 14 (teacher), 0-8	decimal	scale value	0 to 8
ntvicpr1/2	derived	teacher qnr	Victimization Property scale at 14 (teacher), 0-8	decimal	scale value	0 to 8
ntvicso1/2	derived	teacher qnr	Victimization Social Manipulation scale at 14 (teacher), 0-8	decimal	scale value	0 to 8
ntvicve1/2	derived	teacher qnr	Victimization Verbal scale at 14 (teacher), 0-8	decimal	scale value	0 to 8
nvcatm1/2	derived	twin web	Mean item answer time for Vocabulary test at 14 (seconds)	decimal	quantitative	approx. 0-30 seconds
nvcdata1/2	item	twin web	Vocabulary web test data available at 14, 1Y 0N	integer	nominal	0=no, 1=yes
nvcsess1/2	item	twin web	Number of sessions to complete Vocabulary web test at 14	integer	quantitative	approx. 1-5 sessions
nvcstat1/2	item	twin web	Vocabulary web test status (14 year web), see value labels	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=completed but compromised by loss of data, 4=completed but compromised by random responding
nvctime1/2	item	twin web	Time taken to complete Vocabulary web test at 14 (seconds)	integer	quantitative	approx. 0-1000 seconds
nvctot1/2	item	twin web	Total score for Vocabulary web test at 14 (0-54)	integer	scale value	0 to 54
nvctota1/2	derived	twin web	Adjusted total score for Vocabulary web test at 14 (0-53)	decimal	scale value	0 to 54
nvcXXan1/2 (XX is the item number, 01-27)	item	twin web	Vocabulary item XX answer selected (14yr twin web), see value labels	integer	nominal	1 to 4 (answer selected) or -2=discontinued, -4=crashed
nvcXXsc1/2 (XX is the item number, 01-27)	item	twin web	Vocabulary item XX score (14yr twin web), 2right 1partly right 0wrong	integer	ordinal	0=incorrect, 1=alternative correct response, 2=best correct response (items 1, 2, 6, 9, 10 do not have 1-point responses)
nwave	item	admin	Wave of data collection for 14yr study, 1=first wave (cohort 1), 2=second wave (cohorts 2/3/4)	integer	nominal	1=first wave, 2=second wave