TEDS Data Dictionary

Variables in the 18 Year Dataset

The table on this page lists all 18 Year variables. This includes all item variables from the 18 Year questionnaires and web activities, as well as derived variables that are based on 18 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
Dataset variable label
Item or derived variable?
Source of data:
- qnr - from the twin 18 year questionnaire
- perception - from the twin Perception web study
- bricks - from the twin Bricks web study
- KC - from the twin Kings Challenge web study
- nav - from the twin Navigation web study
- FFMP - from the twin Fashion Food and Music Preferences web study
- admin - administrative data, logged in the TEDS admin database
Data type:
- integer - numeric whole numbers
- decimal - numeric with fractional values
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	dataset variable label	item or derived variable?	source of data	data type	variable type	coding or approximate range of values
rcb2dt1/2	2D tests overall score (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcb2rdata1/2	2r test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb2rstat1/2	2r test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb2rtime1/2	2r test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb2rtmn1/2	2r test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb2rtot1/2	2r test total score (twin Bricks web study), 0-9	derived	bricks	integer	scale value	0 to 9
rcb2rvdata1/2	2rv test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb2rvstat1/2	2rv test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb2rvtime1/2	2rv test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb2rvtmn1/2	2rv test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb2rvtot1/2	2rv test total score (twin Bricks web study), 0-9	derived	bricks	integer	scale value	0 to 9
rcb2rvXXr1/2 (XX is the item number p1, p2 or 01-12)	2rv test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb2rvXXs1/2 (XX is the item number 01-12)	2rv test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb2rvXXt1/2 (XX is the item number p1, p2 or 01-12)	2rv test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcb2rXXr1/2 (XX is the item number p1, p2 or 01-12)	2r test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb2rXXs1/2 (XX is the item number 01-12)	2r test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb2rXXt1/2 (XX is the item number p1, p2 or 01-12)	2r test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcb2vdata1/2	2v test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb2vstat1/2	2v test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb2vtime1/2	2v test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb2vtmn1/2	2v test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb2vtot1/2	2v test total score (twin Bricks web study), 0-9	derived	bricks	integer	scale value	0 to 9
rcb2vXXr1/2 (XX is the item number p1, p2 or 01-12)	2v test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb2vXXs1/2 (XX is the item number 01-12)	2v test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb2vXXt1/2 (XX is the item number p1, p2 or 01-12)	2v test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcb3dt1/2	3D tests overall score (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcb3rdata1/2	3r test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb3rstat1/2	3r test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb3rtime1/2	3r test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb3rtmn1/2	3r test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb3rtot1/2	3r test total score (twin Bricks web study), 0-9	derived	bricks	integer	scale value	0 to 9
rcb3rvdata1/2	3rv test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb3rvstat1/2	3rv test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb3rvtime1/2	3rv test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb3rvtmn1/2	3rv test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb3rvtot1/2	3rv test total score (twin Bricks web study), 0-9	derived	bricks	integer	scale value	0 to 9
rcb3rvXXr1/2 (XX is the item number p1, p2 or 01-12)	3rv test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb3rvXXs1/2 (XX is the item number 01-12)	3rv test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb3rvXXt1/2 (XX is the item number p1, p2 or 01-12)	3rv test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcb3rXXr1/2 (XX is the item number p1, p2 or 01-12)	3r test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb3rXXs1/2 (XX is the item number 01-12)	3r test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb3rXXt1/2 (XX is the item number p1, p2 or 01-12)	3r test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcb3vdata1/2	3v test completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcb3vstat1/2	3v test status (twin Bricks web study), see value labels	derived	bricks	integer	nominal	0=not started, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcb3vtime1/2	3v test time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcb3vtmn1/2	3v test mean item response time (twin Bricks web study), seconds	derived	bricks	decimal	quantitative	approx 0 to 15 (seconds)
rcb3vtot1/2	3v test total score (twin Bricks web study), 0-12	item	bricks	integer	scale value	0 to 12
rcb3vXXr1/2 (XX is the item number p1, p2 or 01-12)	3v test item XX response (twin Bricks web study), see value labels	item	bricks	integer	nominal	1=A, 2=B, 3=C, 4=D (image selected)
rcb3vXXs1/2 (XX is the item number 01-12)	3v test item XX score (twin Bricks web study), 1=correct 0=incorrect	item	bricks	integer	ordinal	0=incorrect, 1=correct
rcb3vXXt1/2 (XX is the item number p1, p2 or 01-12)	3v test item XX response time (twin Bricks web study), milliseconds	item	bricks	integer	quantitative	approx 0 to 20,000 (milliseconds)
rcbage1/2	Age of twin on starting Bricks web study activities, years	derived	bricks	decimal	quantitative	approx 19.5 to 21.2 (years)
rcbcndata1/2	Consent page completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcbcntime1/2	Consent page time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 10 (minutes)
rcbdata	Bricks web study data present (either twin), 1Y 0N	derived	bricks	integer	nominal	0=no, 1=yes
rcbdata1/2	Twin Bricks web study activity data present, 1Y 0N	derived	bricks	integer	nominal	0=no, 1=yes
rcbdurtn1/2	Duration of battery from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 4 to 1000 (minutes)
rcbLLCage1	Age of twin on starting Bricks web study activities (for use in LLC TRE), months	derived	bricks	integer	quantitative	approx. 234 to 254 (months)
rcbLLCdate1	Date when Bricks web study activities were started (for use in LLC TRE), yyyy-mm string	derived	bricks	string	date value	'2015-02' to '2015-03'
rcbnact1/2	Number of Bricks web study activities completed (including consent and comments), 0-9	derived	bricks	integer	ordinal	0 to 9
rcbndat1/2	Number of Bricks web study activities with valid data, 0 to 7	derived	bricks	integer	ordinal	0 to 7 (number of activities)
rcbrt1/2	Rotation tests overall score (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcbrvt1/2	Rotation and Visualisation tests overall score (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcbspdata1/2	SPAA questionnaire completed (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcbspgnx11/2	SPAA general anxiety qnr item 1: nervous or anxious (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx21/2	SPAA general anxiety qnr item 2: cannot stop worrying (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx31/2	SPAA general anxiety qnr item 3: worrying too much (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx41/2	SPAA general anxiety qnr item 4: trouble relaxing (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx51/2	SPAA general anxiety qnr item 5: restless (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx61/2	SPAA general anxiety qnr item 6: annoyed or irritable (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnx71/2	SPAA general anxiety qnr item 7: feeling afraid (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=several days, 3=more than half the days, 4=nearly every day
rcbspgnxm1/2	SPAA general anxiety overall mean scale (twin Bricks web study), 1 to 4	derived	bricks	decimal	scale value	1 to 4
rcbspmnx11/2	SPAA maths anxiety qnr item 1: using maths tables (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx21/2	SPAA maths anxiety qnr item 2: thinking about test (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx31/2	SPAA maths anxiety qnr item 3: watching teacher (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx41/2	SPAA maths anxiety qnr item 4: taking an exam (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx51/2	SPAA maths anxiety qnr item 5: difficult maths problems (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx61/2	SPAA maths anxiety qnr item 6: maths lecture (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx71/2	SPAA maths anxiety qnr item 7: explaining a formula (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx81/2	SPAA maths anxiety qnr item 8: surprise quiz (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnx91/2	SPAA maths anxiety qnr item 9: reading maths book (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspmnxm1/2	SPAA maths anxiety overall mean scale (twin Bricks web study), 1 to 5	derived	bricks	decimal	scale value	1 to 5
rcbspneng1/2	SPAA qnr: English is native language (twin Bricks web study), 1Y 0N	item	bricks	integer	nominal	0=no, 1=yes
rcbspsab11/2	SPAA spatial ability qnr item 1: sense of direction (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab1r1/2	Reversed version of SPAA spatial ability qnr item 1 (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly disagree, 2=disagree, 3=neither agree nor disagree, 4=agree, 5=strongly agree
rcbspsab21/2	SPAA spatial ability qnr item 2: imagining 2D objects in 3D (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab2r1/2	Reversed version of SPAA spatial ability qnr item 2 (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly disagree, 2=disagree, 3=neither agree nor disagree, 4=agree, 5=strongly agree
rcbspsab31/2	SPAA spatial ability qnr item 3: trouble remembering landmarks (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab3r1/2	Reversed version of SPAA spatial ability qnr item 3 (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly disagree, 2=disagree, 3=neither agree nor disagree, 4=agree, 5=strongly agree
rcbspsab41/2	SPAA spatial ability qnr item 4: trouble imagining perspective (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab51/2	SPAA spatial ability qnr item 5: rarely get lost (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab5r1/2	Reversed version of SPAA spatial ability qnr item 5 (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly disagree, 2=disagree, 3=neither agree nor disagree, 4=agree, 5=strongly agree
rcbspsab61/2	SPAA spatial ability qnr item 6: struggle to rotate objects (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab71/2	SPAA spatial ability qnr item 7: good spatial ability (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsab7r1/2	Reversed version of SPAA spatial ability qnr item 7 (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly disagree, 2=disagree, 3=neither agree nor disagree, 4=agree, 5=strongly agree
rcbspsab81/2	SPAA spatial ability qnr item 8: do not know where I am (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=strongly agree, 2=agree, 3=neither agree nor disagree, 4=disagree, 5=strongly disagree
rcbspsabm1/2	SPAA spatial ability overall mean scale (twin Bricks web study), 1 to 5	derived	bricks	decimal	scale value	1 to 5
rcbspsnx011/2	SPAA spatial anxiety qnr item 1: finding way around streets (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx021/2	SPAA spatial anxiety qnr item 2: directing in windowless room (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx031/2	SPAA spatial anxiety qnr item 3: locating vehicle (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx041/2	SPAA spatial anxiety qnr item 4: complex jigsaw (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx051/2	SPAA spatial anxiety qnr item 5: finding way unfamiliar place (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx061/2	SPAA spatial anxiety qnr item 6: trying new shortcut (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx071/2	SPAA spatial anxiety qnr item 7: following instructions (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx081/2	SPAA spatial anxiety qnr item 8: visualise 3D from 2D (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx091/2	SPAA spatial anxiety qnr item 9: rotate in your mind (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnx101/2	SPAA spatial anxiety qnr item 10: finding in supermarket (twin Bricks web study), see value labels	item	bricks	integer	ordinal	1=not at all, 2=slightly, 3=somewhat, 4=quite, 5=very
rcbspsnxm1/2	SPAA spatial anxiety overall mean scale (twin Bricks web study), 1 to 5	derived	bricks	decimal	scale value	1 to 5
rcbsptime1/2	SPAA questionnaire time interval from start to end (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 0 to 100 (minutes)
rcbstatus1/2	Twin Bricks web activities status, see value labels	derived	bricks	integer	ordinal	0=none completed, 1=some but not all completed, 2=all completed
rcbt1/2	Overall score for all 6 subtests (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcbtime1/2	Total time spent on all activities (twin Bricks web study), minutes	derived	bricks	decimal	quantitative	approx 4 to 200 (minutes)
rcbvt1/2	Visualisation tests overall score (twin Bricks web study), 0-9	derived	bricks	decimal	scale value	0 to 9
rcfage1/2	Age of twin on starting FFMP web study activities, years	derived	FFMP	decimal	quantitative	approx 18.6 to 19.6 (years)
rcfbgdata1/2	Background questionnaire completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcfbgbmi1/2	background: BMI (twin FFMP web study), kilograms per square metre	derived	FFMP	decimal	scale	approx 15 to 40 (kilograms per square metre)
rcfbgfasc1/2	background: fashion conscious (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0=not at all, 1=not really, 2=neutral, 3=somewhat, 4=very much
rcfbghtcm1/2	background: height (twin FFMP web study), centimetres	item	FFMP	integer	quantitative	approx 100 to 200 (centimetres)
rcfbgmusc1/2	background: music conscious (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0=not at all, 1=not really, 2=neutral, 3=somewhat, 4=very much
rcfbgtime1/2	Background questionnaire interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcfbgwtds1/2	background: weight category (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=very underweight, 2=underweight, 3=about the right weight, 4=somewhat overweight, 5=very overweight, 6=obese
rcfbgwtkg1/2	background: weight (twin FFMP web study), kilograms	item	FFMP	integer	quantitative	approx 35 to 150 (kilograms)
rcfcndata1/2	Consent page completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcfcntime1/2	Consent page interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 0 to 5 (minutes)
rcfdata	FFMP web study data present (either twin), 1Y 0N	derived	FFMP	integer	nominal	0=no, 1=yes
rcfdata1/2	Twin FFMP web study activity data present, 1Y 0N	derived	FFMP	integer	nominal	0=no, 1=yes
rcfdurtn1/2	Duration of battery from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 5 to 300 (minutes)
rcffasdata1/2	Fashion questionnaire completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffasstyl11/2	fashion: style 1 urban (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl1r1/2	fashion: style 1 rank urban (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl21/2	fashion: style 2 emo/goth (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl2r1/2	fashion: style 2 rank emo/goth (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl31/2	fashion: style 3 hipster/trendy (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl3r1/2	fashion: style 3 rank hipster/trendy (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl41/2	fashion: style 4 boho/indie (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl4r1/2	fashion: style 4 rank boho/indie (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl51/2	fashion: style 5 luxe sport (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl5r1/2	fashion: style 5 rank luxe sport (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl61/2	fashion: style 6 preppy/elegant/chic (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl6r1/2	fashion: style 6 rank preppy/elegant/chic (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl71/2	fashion: style 7 rocker/grunge (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl7r1/2	fashion: style 7 rank rocker/grunge (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffasstyl81/2	fashion: style 8 athletic/casual (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcffasstyl8r1/2	fashion: style 8 rank athletic/casual (twin FFMP web study), 1 to 8	item	FFMP	integer	ordinal	1 to 8 (rank order)
rcffastime1/2	Fashion questionnaire interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcffd1alpnt1/2	food part 1: allergy to peanuts (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1altnt1/2	food part 1: allergy to tree nuts (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1aldry1/2	food part 1: allergy to dairy (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1alfsh1/2	food part 1: allergy shellfish or fish (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1alglu1/2	food part 1: allergy to wheat/gluten (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1alfru1/2	food part 1: allergy to various fruits (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1aloth1/2	food part 1: other food allergy (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1data1/2	Food questionnaire part 1 completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd1diet1/2	food part 1: type of diet (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=none of the above, 1=pescetarian, 2=vegetarian, 3=vegan
rcffd1hlth1/2	food part 1: healthy diet (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=very unhealthy, 2=somewhat unhealthy, 3=neither particularly healthy nor unhealthy, 4=somewhat healthy, 5=very healthy
rcffd1lkapl1/2	food part 1: like apples (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkapr1/2	food part 1: like apricots (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkavo1/2	food part 1: like avocado (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbac1/2	food part 1: like bacon (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbef1/2	food part 1: like beef (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbkb1/2	food part 1: like baked beans (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbnc1/2	food part 1: like bran cereal (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbre1/2	food part 1: like bread (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkbur1/2	food part 1: like beef burgers (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkchk1/2	food part 1: like chicken (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkchp1/2	food part 1: like chips (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkcoc1/2	food part 1: like cottage cheese (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkegg1/2	food part 1: like eggs (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkgrp1/2	food part 1: like grapes (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkhac1/2	food part 1: like hard cheese (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkham1/2	food part 1: like ham (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkhum1/2	food part 1: like hummus (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lklam1/2	food part 1: like lamb (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkliv1/2	food part 1: like liver (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkmar1/2	food part 1: like marmite (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkmel1/2	food part 1: like melon (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lknut1/2	food part 1: like nuts (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkoif1/2	food part 1: like oily fish (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkora1/2	food part 1: like oranges (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkpch1/2	food part 1: like peaches (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkpor1/2	food part 1: like porridge (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkpot1/2	food part 1: like potatoes (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkrcc1/2	food part 1: like rice/corn cereal (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkric1/2	food part 1: like rice (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lksau1/2	food part 1: like sausages (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lksmn1/2	food part 1: like smoked salmon (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lksoc1/2	food part 1: like soft cheese (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkstr1/2	food part 1: like strawberries (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lksuc1/2	food part 1: like sugared cereal (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lktun1/2	food part 1: like tinned tuna (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkwhc1/2	food part 1: like wheat cereal (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkwhf1/2	food part 1: like white fish (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1lkyog1/2	food part 1: like yogurt (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd1time1/2	Food questionnaire part 1 interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcffd2data1/2	Food questionnaire part 2 completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd2lkapp1/2	food part 2: like apple pie (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkbee1/2	food part 2: like beetroot (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkbrc1/2	food part 2: like broccoli (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkbut1/2	food part 2: like butter (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcak1/2	food part 2: like cake (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcar1/2	food part 2: like carrots (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcel1/2	food part 2: like celery (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkchb1/2	food part 2: like chocolate biscuits (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcho1/2	food part 2: like chocolate (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcor1/2	food part 2: like coriander (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcrm1/2	food part 2: like cream (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcrs1/2	food part 2: like crisps (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcuc1/2	food part 2: like cucumber (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkcus1/2	food part 2: like custard (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkgms1/2	food part 2: like gum sweets (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkgrb1/2	food part 2: like green beans (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkicc1/2	food part 2: like ice cream (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkmus1/2	food part 2: like mushrooms (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkmyn1/2	food part 2: like mayonnaise (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkpar1/2	food part 2: like parsnips (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkpea1/2	food part 2: like peas (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkplb1/2	food part 2: like plain biscuits (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkpnb1/2	food part 2: like peanut butter (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkrdp1/2	food part 2: like red pepper (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkrwt1/2	food part 2: like raw tomato (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lksal1/2	food part 2: like salad (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkspd1/2	food part 2: like spreads (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkspn1/2	food part 2: like spinach (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkspt1/2	food part 2: like brussel sprouts (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkswc1/2	food part 2: like sweetcorn (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2lkvgs1/2	food part 2: like veg soup (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd2time1/2	Food questionnaire part 2 interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcffd3brlk1/2	food part 3: like beer (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3cflk1/2	food part 3: like coffee (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3cfsw1/2	food part 3: sweet coffee (twin FFMP web study), 1sweetened 0not	item	FFMP	integer	nominal	0=unsweetened, 1=sweetened
rcffd3cfwh1/2	food part 3: black coffee (twin FFMP web study), 1white 0black	item	FFMP	integer	nominal	0=black, 1=white
rcffd3data1/2	Food questionnaire part 3 completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd3drcf1/2	food part 3: drink coffee (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd3drte1/2	food part 3: drink tea (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcffd3lkdfz1/2	food part 3: diet fizzy drinks (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3lknfz1/2	food part 3: non diet fizzy drinks (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3lkoj1/2	food part 3: orange juice (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3lksq1/2	food part 3: fruit squash (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3mklk1/2	food part 3: like milk (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3mktp1/2	food part 3: type of milk (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=do not drink milk, 1=non-dairy milk, 2=skimmed milk, 3=semi-skimmed milk, 4=full-fat milk
rcffd3pcpr1/2	food part 3: popcorn preference (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=do not like either, 2=like both, 3=salty, 4=sweet
rcffd3salt1/2	food part 3: add salt to food (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0=never, 1=rarely, 2=sometimes, 3=usually, 4=always
rcffd3splk1/2	food part 3: like spicy food (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=not applicable, 1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3swtt1/2	food part 3: sweet tooth (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0=not at all, 1=not really, 2=neither agree nor disagree, 3=somewhat, 4=very much
rcffd3telk1/2	food part 3: like tea (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3tesw1/2	food part 3: sweet tea (twin FFMP web study), 1sweetened 0not	item	FFMP	integer	nominal	0=unsweetened, 1=sweetened
rcffd3tewh1/2	food part 3: black tea (twin FFMP web study), 1white 0black	item	FFMP	integer	nominal	0=black, 1=white
rcffd3time1/2	Food questionnaire part 3 interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcffd3wnlk1/2	food part 3: like wine (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	1=dislike a lot, 2=dislike a little, 3=neither like nor dislike, 4=like a little, 5=like a lot
rcffd3wntp1/2	food part 3: wine preference (twin FFMP web study), see value labels	item	FFMP	integer	nominal	0=do not drink wine, 1=do not like any, 2=like all, 3=rose, 4=red, 5=white
rcfLLCage1	Age of twin on starting FFMP web study activities (for use in LLC TRE), months	derived	FFMP	integer	quantitative	approx. 224 to 235 (months)
rcfLLCdate1	Date when FFMP web study activities were started (for use in LLC TRE), yyyy-mm string	derived	FFMP	string	date value	'2015-03' to '2015-04'
rcfmusdata1/2	Music questionnaire completed (twin FFMP web study), 1Y 0N	item	FFMP	integer	nominal	0=no, 1=yes
rcfmusgnr011/2	music: genre 1 pop (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr01r1/2	music: genre rank folk (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr021/2	music: genre 2 hip hop/rap (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr02r1/2	music: genre rank classical (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr031/2	music: genre 3 rb/soul (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr03r1/2	music: genre rank jazz (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr041/2	music: genre 4 rock (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr04r1/2	music: genre rank pop (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr051/2	music: genre 5 metal (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr05r1/2	music: genre rank hip hop/rap (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr061/2	music: genre 6 dance/electronic (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr06r1/2	music: genre rank rb/soul (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr071/2	music: genre 7 alternative/indie (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr07r1/2	music: genre rank rock (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr081/2	music: genre 8 jazz (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr08r1/2	music: genre rank metal (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr091/2	music: genre 9 classical (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr09r1/2	music: genre rank dance/electronic (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmusgnr101/2	music: genre 10 folk (twin FFMP web study), see value labels	item	FFMP	integer	ordinal	0 to 9, where 0=not at all and 9=a lot
rcfmusgnr10r1/2	music: genre rank alternative/indie (twin FFMP web study), 1 to 10	item	FFMP	integer	ordinal	1 to 10 (rank order)
rcfmustime1/2	Music questionnaire interval from start to end (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 1 to 15 (minutes)
rcfnact1/2	Number of FFMP web study activities completed (including consent), 0-7	derived	FFMP	integer	quantitative	0 to 7 (number of questionnaire sections)
rcfstatus1/2	Twin FFMP web activities status, see value labels	derived	FFMP	integer	nominal	0=none completed, 1=some but not all completed, 2=all completed
rcftime1/2	Total time spent on all activities (twin FFMP web study), minutes	derived	FFMP	decimal	quantitative	approx 5 to 60 (minutes)
rck2ddata1/2	2d test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rck2dstat1/2	2d test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rck2dtime1/2	2d test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rck2dtmn1/2	2d test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 10 to 45 (seconds)
rck2dtot1/2	2d test total score (twin Kings Challenge web study), 0 to 5	item	KC	decimal	scale value	0 to 5
rck2dtotp1/2	2d test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rck2dXan1/2 (X is the item number 1-5)	2d test item X response (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	1=within time limit but zero score, 2=exceeded time limit with non-zero score, 3=within time limit and non-zero score, -1=timed out, -4=crashed or interrupted
rck2dXrt1/2 (X is the item number 1-5)	2d test item X response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 45000
rck2dXsc1/2 (X is the item number 1-5)	2d test item X score (twin Kings Challenge web study), 0 to 1 decimal	item	KC	decimal	scale value	0 to 1
rck3ddata1/2	3d test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rck3dstat1/2	3d test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rck3dtime1/2	3d test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 10 (minutes)
rck3dtmn1/2	3d test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 70 (seconds)
rck3dtot1/2	3d test total score (twin Kings Challenge web study), 0 to 7	item	KC	decimal	scale value	0 to 7
rck3dtotp1/2	3d test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rck3dXan1/2 (X is the item number 1-7)	3d test item X response (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	1=within time lmit but zero score, 2=exceeded time limit with non-zero score, 3=within time limit and non-zero score, -1=timed out, -4=crashed or interrupted
rck3dXrt1/2 (X is the item number 1-7)	3d test item X response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 70000
rck3dXsc1/2 (X is the item number 1-7)	3d test item X score (twin Kings Challenge web study), 0 to 1 decimal	item	KC	decimal	scale value	0 to 1
rckage1/2	Age of twin on starting Kings Challenge web study activities, years	derived	KC	decimal	quantitative	approx 19.7 to 21.5 (years)
rckcnbrws1/2	Browser used on consent page (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=Chrome, 2=Safari, 3=Mozilla, 4=Firefox, 5=Explorer
rckcndata1/2	Consent page completed (twin Kings Challenge web study), 1Y 0N	item	KC	integer	nominal	0=no, 1=yes
rckcndevwdth1/2	Screen width of device used on consent page, categorised (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=small (less than 768 pixels), 2=medium (768-1199 pixels), 3=large (1200 pixels or larger)
rckcnos1/2	Operating system of device used on consent page (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=iPhone/iPad, 2=Android, 3=Windows, 4=Mac, 5=Linux
rckcntime1/2	consent page time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	scale value	approx 0 to 5 (minutes)
rckcsdata1/2	cs test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckcsstat1/2	cs test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckcstime1/2	cs test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckcstmn1/2	cs test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 3 to 15 (seconds)
rckcstot1/2	cs test total score (twin Kings Challenge web study), 0 to 15	item	KC	integer	scale value	0 to 15
rckcstotp1/2	cs test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckcsXXan1/2 (XX is the item number 01-15)	cs test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=A, 2=B, 3=C, 4=D, 5=E, -1=timed out, -2=discontinued, -4=crashed or interrupted
rckcsXXrt1/2 (XX is the item number 01-15)	cs test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 20000
rckcsXXsc1/2 (XX is the item number 01-15)	cs test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rckdata	Kings Challenge web study data present (either twin), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckdata1/2	Twin Kings Challenge web study activity data present, 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckdurtn1/2	duration of battery from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 150 (minutes)
rckemdata1/2	em test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckemstat1/2	em test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckemtime1/2	em test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 2 (minutes)
rckemtot1/2	em test total score (twin Kings Challenge web study), 0 to 10	item	KC	decimal	scale value	0 to 10
rckemtotp1/2	em test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckemXXan1/2 (XX is the item number 01-10)	em test item XX response (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	1=some input but zero score, 2=some input and non-zero score, -1=no input hence default response: effective timeout, -4=crashed or interrupted
rckemXXsc1/2 (XX is the item number 01-10)	em test item XX score (twin Kings Challenge web study), 0 to 1 decimal	item	KC	decimal	scale value	0 to 1
rckLLCage1	Age of twin on starting Kings Challenge web study activities (for use in LLC TRE), months	derived	KC	integer	quantitative	approx. 237 to 258 (months)
rckLLCdate1	Date on starting Kings Challenge web study activities (for use in LLC TRE), yyyy-mm string	derived	KC	string	date value	'2015-05' to '2015-08'
rckmadata1/2	ma test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckmastat1/2	ma test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckmatime1/2	ma test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckmatmn1/2	ma test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 25 (seconds)
rckmatot1/2	ma test total score (twin Kings Challenge web study), 0 to 10	item	KC	integer	scale value	0 to 10
rckmatotp1/2	ma test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckmaXXan1/2 (XX is the item number 01-10)	ma test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=1A, 2=1B, 3=1C, 4=1D, 5=2A, 6=2B, 7=2C, 8=2D, 9=3A, 10=3B, 11=3C, 12=3D, -1=timed out, -2=discontinued, -4=crashed or interrupted
rckmaXXrt1/2 (XX is the item number 01-10)	ma test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 25000
rckmaXXsc1/2 (XX is the item number 01-10)	ma test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rckmrdata1/2	mr test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckmrstat1/2	mr test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckmrtime1/2	mr test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckmrtmn1/2	mr test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 20 (seconds)
rckmrtot1/2	mr test total score (twin Kings Challenge web study), 0 to 16	item	KC	integer	scale value	0 to 16
rckmrtotp1/2	mr test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckmrXXan1/2 (XX is the item number 01-16)	mr test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1, 2, 3, 4 (response selected, encoding varies between items), -1=timed out, -4=crashed or interrupted
rckmrXXrt1/2 (XX is the item number 01-16)	mr test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 25000
rckmrXXsc1/2 (XX is the item number 01-16)	mr test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rcknact1/2	Number of Kings Challenge web study activities completed, 0 to 11	derived	KC	integer	ordinal	0 to 11 (number of activities)
rckndat1/2	Number of Kings Challenge web study activities with valid data, 0 to 10	derived	KC	integer	ordinal	0 to 10 (number of activities)
rckpadata1/2	pa test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckpastat1/2	pa test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckpatime1/2	pa test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckpatmn1/2	pa test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 20 (seconds)
rckpatot1/2	pa test total score (twin Kings Challenge web study), 0 to 15	item	KC	integer	scale value	0 to 15
rckpatotp1/2	pa test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckpaXsc1/2 (XX is the item number 01-15)	pa test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rckpaXXan1/2 (XX is the item number 01-15)	pa test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=A, 2=B, 3=C, 4=D, 5=E, -1=timed out, -2=discontinued, -4=crashed or interrupted
rckpaXXrt1/2 (XX is the item number 01-15)	pa test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 20000
rckpfdata1/2	pf test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckpfstat1/2	pf test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckpftime1/2	pf test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckpftmn1/2	pf test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 20 (seconds)
rckpftot1/2	pf test total score (twin Kings Challenge web study), 0 to 15	item	KC	integer	scale value	0 to 15
rckpftotp1/2	pf test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckpfXXan1/2 (XX is the item number 01-15)	pf test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=A, 2=B, 3=C, 4=D, 5=E, -1=timed out, -2=discontinued, -4=crashed or interrupted
rckpfXXrt1/2 (XX is the item number 01-15)	pf test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 20000
rckpfXXsc1/2 (XX is the item number 01-15)	pf test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rckptdata1/2	pt test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rckptstat1/2	pt test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rckpttime1/2	pt test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rckpttmn1/2	pt test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 15 (seconds)
rckpttot1/2	pt test total score (twin Kings Challenge web study), 0 to 15	item	KC	integer	scale value	0 to 15
rckpttotp1/2	pt test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rckptXXan1/2 (XX is the item number 01-15)	pt test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1, 2, 3, 4, 5, 6, 7, 8 (corner of cube selected), -1=timed out, -2=discontinued, -4=crashed or interrupted
rckptXXrt1/2 (XX is the item number 01-15)	pt test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 20000
rckptXXsc1/2 (XX is the item number 01-15)	pt test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rcksrdata1/2	sr test completed (twin Kings Challenge web study), 1Y 0N	derived	KC	integer	nominal	0=no, 1=yes
rcksrstat1/2	sr test status (twin Kings Challenge web study), see value labels	derived	KC	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcksrtime1/2	sr test time interval from start to end (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 0 to 5 (minutes)
rcksrtmn1/2	sr test mean item response time (twin Kings Challenge web study), seconds	derived	KC	decimal	quantitative	approx 0 to 20 (seconds)
rcksrtot1/2	sr test total score (twin Kings Challenge web study), 0 to 15	item	KC	integer	scale value	0 to 15
rcksrtotp1/2	sr test total percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rcksrXXan1/2 (XX is the item number 01-15)	sr test item XX response (twin Kings Challenge web study), see value labels	item	KC	integer	nominal	1=A, 2=B, 3=C, 4=D, 5=E, -1=timed out, -2=discontinued, -4=crashed or interrupted
rcksrXXrt1/2 (XX is the item number 01-15)	sr test item XX response time (twin Kings Challenge web study), milliseconds	item	KC	integer	quantitative	0 to 20000
rcksrXXsc1/2 (XX is the item number 01-15)	sr test item XX score (twin Kings Challenge web study), 1=correct 0=incorrect	item	KC	integer	nominal	0=incorrect, 1=correct
rckstatus1/2	Twin Kings Challenge web study battery status, see value labels	derived	KC	integer	ordinal	0=none completed, 1=some but not all completed, 2=all completed
rcktime1/2	total time spent on all activities (twin Kings Challenge web study), minutes	derived	KC	decimal	quantitative	approx 5 to 60 (minutes)
rcktot1/2	grand total battery score (twin Kings Challenge web study), 0 to 123	item	KC	decimal	scale value	0 to 123
rcktotp1/2	grand total battery percentage score (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rcktotpu1/2	grand total battery percentage score, unweighted (twin Kings Challenge web study), 0 to 100	item	KC	decimal	scale value	0 to 100
rcnage1/2	Age of twin on starting Navigation web study activities, years	derived	nav	decimal	quantitative	approx 20.1 to 22.2 (years)
rcnas1/2	Navigation battery grand total accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcncnbrws1/2	consent: browser type (twin Navigation web study), see value labels	item	nav	integer	nominal	1=Chrome, 2=Safari, 3=Mozilla, 4=Firefox, 5=Explorer
rcncndata1/2	consent: completed (twin Navigation web study), 1Y 0N	item	nav	integer	nominal	0=no, 1=yes
rcncndevwdth1/2	Screen width of device used on consent page, categorised (twin Kings Challenge web study), see value labels	item	nav	integer	nominal	1=small (less than 768 pixels), 2=medium (768-1199 pixels), 3=large (1200 pixels or larger)
rcncnos1/2	consent: operating system (twin Navigation web study), see value labels	item	nav	integer	nominal	1=iPhone/iPad, 2=Android, 3=Windows, 4=Mac, 5=Linux
rcncntime1/2	consent: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 0 to 5 (minutes)
rcncntl1/2	Twin Navigation web study: pointer control type, see value labels	item	nav	integer	nominal	1=mouse, 2=trackpad
rcndata	Navigation web study: data present (either twin), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcndata1/2	Twin Navigation web study: data present, 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcndurtn1/2	Twin Navigation web study: time interval from start to end, if battery completed, minutes	derived	nav	decimal	quantitative	approx 35 to 250 (minutes)
rcnLLCage1	Age of twin on starting Navigation web study activities (for use in LLC TRE), months	derived	nav	integer	quantitative	approx. 242 to 268 (months)
rcnLLCdate1	Date when Navigation web study activities were started (for use in LLC TRE), yyyy-mm string	derived	nav	string	date value	'2015-09' to '2016-05'
rcnmnas1/2	map reading no memory: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmnss1/2	map reading no memory: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmnts1/2	map reading no memory: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmnXas1/2 (X is the mission number, 1-5)	map reading no memory mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	ordinal	0=failed, 0.25=completed with error on 2nd attempt, 0.5=completed without error on 2nd attempt, 0.75=completed with error on 1st attempt, 1=completed without error on 1st attempt
rcnmnXaZct1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading no memory mission X, attempt Z: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 20 to 60 (seconds)
rcnmnXaZr1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading no memory mission X attempt Z: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=mission timed out with no input, -3=attempt skipped (earlier attempt completed), -1=attempt failed due to timeout, 1=attempt completed with an error, 2=attempt completed without error
rcnmnXaZrt1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading no memory mission X, attempt Z: reaction time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 30 (seconds)
rcnmnXdata1/2 (X is the mission number, 1-5)	map reading no memory mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnmnXdurn1/2 (X is the mission number, 1-5)	map reading no memory mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 20 to 120 (seconds)
rcnmnXss1/2 (X is the mission number, 1-5)	map reading no memory mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmnXstat1/2 (X is the mission number, 1-5)	map reading no memory mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data
rcnmnXtime1/2 (X is the mission number, 1-5)	map reading no memory mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 1 to 3 (minutes)
rcnmnXts1/2 (X is the mission number, 1-5)	map reading no memory mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmwas1/2	map reading with memory: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmwss1/2	map reading with memory: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmwts1/2	map reading with memory: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmwXas1/2 (X is the mission number, 1-5)	map reading with memory mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	ordinal	0=failed, 0.25=completed with error on 2nd attempt, 0.5=completed without error on 2nd attempt, 0.75=completed with error on 1st attempt, 1=completed without error on 1st attempt
rcnmwXaZct1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading with memory mission X, attempt Z: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 25 to 120 (seconds)
rcnmwXaZr1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading with memory mission X attempt Z: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=mission timed out with no input, -3=attempt skipped (earlier attempt completed), -1=attempt failed due to timeout, 1=attempt completed with an error, 2=attempt completed without error
rcnmwXaZrt1/2 (X is the mission number, 1-5; Z is the attempt number, 1-2)	map reading with memory mission X, attempt Z: reaction time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 30 (seconds)
rcnmwXdata1/2 (X is the mission number, 1-5)	map reading with memory mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnmwXdurn1/2 (X is the mission number, 1-5)	map reading with memory mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 25 to 240 (seconds)
rcnmwXss1/2 (X is the mission number, 1-5)	map reading with memory mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnmwXstat1/2 (X is the mission number, 1-5)	map reading with memory mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data
rcnmwXtime1/2 (X is the mission number, 1-5)	map reading with memory mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 1 to 6 (minutes)
rcnmwXts1/2 (X is the mission number, 1-5)	map reading with memory mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnnact1/2	Twin Navigation web study: number of missions completed, 0-30	derived	nav	integer	ordinal	0 to 30
rcnndat1/2	Number of Navigation web study activities with valid data, 0-30	derived	nav	integer	ordinal	0 to 30
rcnodas1/2	orientation direction: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodss1/2	orientation direction: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodts1/2	orientation direction: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodXas1/2 (X is the mission number, 1-5)	orientation direction mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodXdata1/2 (X is the mission number, 1-5)	orientation direction mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnodXdurn1/2 (X is the mission number, 1-5)	orientation direction mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 40 to 180 (seconds)
rcnodXss1/2 (X is the mission number, 1-5)	orientation direction mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodXstat1/2 (X is the mission number, 1-5)	orientation direction mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data
rcnodXtime1/2 (X is the mission number, 1-5)	orientation direction mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 2 to 5 (minutes)
rcnodXts1/2 (X is the mission number, 1-5)	orientation direction mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnodXtYas1/2 (X is the mission number, 1-5; Y is the task number, 1-6)	orientation direction mission X task Y: accuracy score (twin Navigation web study), 0/1/2/3	derived	nav	integer	ordinal	0=failed, 1=completed on 3rd attempt, 2=completed on 2nd attempt, 3=completed on 1st attempt
rcnodXtYaZct1/2 (X is the mission number, 1-5; Y is the task number, 1-6; Z is the attempt number, 1-3)	orientation direction mission X, task Y, attempt Z: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 10 to 50 (seconds)
rcnodXtYaZr1/2 (X is the mission number, 1-5; Y is the task number, 1-6; Z is the attempt number, 1-3)	orientation direction mission X task Y attempt Z: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=mission timed out with no input, -3=attempt skipped (earlier attempt completed), -2=attempt discontinued after mission timeout, 0=attempt failed, 1=attempt successfully completed
rcnodXtYaZrt1/2 (X is the mission number, 1-5; Y is the task number, 1-6; Z is the attempt number, 1-3)	orientation direction mission X, task Y, attempt Z: reaction time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 30 (seconds)
rcnolas1/2	orientation landmarks: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolss1/2	orientation landmarks: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolts1/2	orientation landmarks: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolXas1/2 (X is the mission number, 1-5)	orientation landmarks mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolXdata1/2 (X is the mission number, 1-5)	orientation landmarks mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnolXdurn1/2 (X is the mission number, 1-5)	orientation landmarks mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 100 to 300 (seconds)
rcnolXss1/2 (X is the mission number, 1-5)	orientation landmarks mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolXstat1/2 (X is the mission number, 1-5)	orientation landmarks mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data
rcnolXtime1/2 (X is the mission number, 1-5)	orientation landmarks mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 2 to 5 (minutes)
rcnolXts1/2 (X is the mission number, 1-5)	orientation landmarks mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnolXtYas1/2 (X is the mission number, 1-5)	orientation landmarks mission X task Y: accuracy score (twin Navigation web study), 0 or 1	derived	nav	integer	ordinal	0=failed, 1=completed
rcnolXtYct1/2 (X is the mission number, 1-5; Y is the task number, 1-5)	orientation landmarks mission X, task Y: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 10 to 60 (seconds)
rcnolXtYr1/2 (X is the mission number, 1-5; Y is the task number, 1-5)	orientation landmarks mission X task Y: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=task timed out with no input, -1=task failed due to timeout, 1=task successfully completed
rcnolXtYrt1/2 (X is the mission number, 1-5; Y is the task number, 1-5)	orientation landmarks mission X, task Y: reaction time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 60 (seconds)
rcnplug1/2	Twin Navigation web study: browser plugin, see value labels	item	nav	integer	nominal	1=WebGL v1.11, 2=WebGL v1.2, 3=WebPlayer v1.11, 4=WebPlayer v1.2
rcnpsas1/2	perspective: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnpsss1/2	perspective: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnpsts1/2	perspective: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnpsXas1/2 (X is the mission number, 1-5)	perspective mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	ordinal	0=failed, 0.25=completed on 4th attempt, 0.5=completed on 3rd attempt, 0.75=completed on 2nd attempt, 1=completed on 1st attempt
rcnpsXaZct1/2 (X is the mission number, 1-5; Z is the attempt number, 1-4)	perspective mission X, attempt Z: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 60 (seconds)
rcnpsXaZr1/2 (X is the mission number, 1-5; Z is the attempt number, 1-4)	perspective mission X attempt Z: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=mission timed out with no input, -3=attempt skipped (earlier attempt completed), -2=attempt discontinued after mission timeout, 0=attempt failed, 1=attempt successfully completed
rcnpsXdata1/2 (X is the mission number, 1-5)	perspective mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnpsXdurn1/2 (X is the mission number, 1-5)	perspective mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 3 to 60 (seconds)
rcnpsXss1/2 (X is the mission number, 1-5)	perspective mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnpsXstat1/2 (X is the mission number, 1-5)	perspective mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcnpsXtime1/2 (X is the mission number, 1-5)	perspective mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 0 to 2 (minutes)
rcnpsXts1/2 (X is the mission number, 1-5)	perspective mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnscas1/2	scanning: overall accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnscss1/2	scanning: overall speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnscts1/2	scanning: overall total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnscXas1/2 (X is the mission number, 1-5)	scanning mission X: accuracy score (twin Navigation web study), 0-1	derived	nav	decimal	ordinal	0=failed, 0.25=completed on 4th attempt, 0.5=completed on 3rd attempt, 0.75=completed on 2nd attempt, 1=completed on 1st attempt
rcnscXaZct1/2 (X is the mission number, 1-5; Z is the attempt number, 1-4)	scanning mission X, attempt Z: completion time (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 0 to 60 (seconds)
rcnscXaZr1/2 (X is the mission number, 1-5; Z is the attempt number, 1-4)	scanning mission X attempt Z: response outcome (twin Navigation web study), see value labels	derived	nav	integer	nominal	-4=mission timed out with no input, -3=attempt skipped (earlier attempt completed), -2=attempt discontinued after mission timeout, 0=attempt failed, 1=attempt successfully completed
rcnscXdata1/2 (X is the mission number, 1-5)	scanning mission X: data present (twin Navigation web study), 1Y 0N	derived	nav	integer	nominal	0=no, 1=yes
rcnscXdurn1/2 (X is the mission number, 1-5)	scanning mission X: mission duration (twin Navigation web study), seconds	item	nav	decimal	quantitative	approx 4 to 60 (seconds)
rcnscXss1/2 (X is the mission number, 1-5)	scanning mission X: speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnscXstat1/2 (X is the mission number, 1-5)	scanning mission X: status (twin Navigation web study), see value labels	derived	nav	integer	nominal	0=not started, 1=started but not finished, 2=successfully completed, 3=compromised by loss of data, 4=random responses
rcnscXtime1/2 (X is the mission number, 1-5)	scanning mission X: time interval from start to end (twin Navigation web study), minutes	derived	nav	decimal	quantitative	approx 0 to 2 (minutes)
rcnscXts1/2 (X is the mission number, 1-5)	scanning mission X: total score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnss1/2	Navigation battery grand total speed score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnstatus1/2	Twin Navigation web study: overall battery status, see value labels	derived	nav	integer	nominal	0=none completed, 1=some but not all completed, 2=all completed
rcntime1/2	Twin Navigation web study: total of mission times, if battery completed, minutes	derived	nav	decimal	quantitative	approx 30 to 80 (minutes)
rcnts1/2	Navigation battery grand total overall score (twin Navigation web study), 0-1	derived	nav	decimal	scale	0 to 1
rcnwave1/2	Twin Navigation web study: invitation wave, 1 or 2	item	nav	integer	nominal	1 or 2
rcpage1/2	Age of twin on starting Perception web study activities, years	derived	perception	decimal	quantitative	approx 18 to 20 (years)
rcpaspXX1/2 (XX is the item number 0 to 24)	ASP qnr item XX response (twin Perception web study), see value labels	item	perception	integer	ordinal	0=almost never, 1=rarely, 2=sometimes, 3=often, 4=almost always
rcpaspXXr1/2 (XX is the item number 3, 5, 7, 9, 12, 14, 17 or 20)	Reversed version of ASP qnr item XX (twin Perception web study), see value labels	item	perception	integer	ordinal	0=almost always, 1=often, 2=sometimes, 3=rarely, 4=almost never
rcpaspdata1/2	ASP questionnaire completed (twin Perception web study), 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpaspfpet1/2	ASP Face perception: Emotion score (twin Perception web study),0-24	item	perception	integer	scale value	0 to 24
rcpaspfpit1/2	ASP Face perception: Identity score (twin Perception web study),0-24	item	perception	integer	scale value	0 to 24
rcpaspnfet1/2	ASP Non-face perception: Emotion score (twin Perception web study),0-24	item	perception	integer	scale value	0 to 24
rcpaspnsot1/2	ASP Non-social object perception score (twin Perception web study),0-24	item	perception	integer	scale value	0 to 24
rcpaspt1/2	ASP qnr Social (identity + emotion) total score (twin Perception web study),0-72	item	perception	integer	scale value	0 to 72
rcpasptime1/2	Time interval from start to end of ASP qnr (twin Perception web study), minutes	derived	perception	decimal	quantitative	approx 1 to 20 (minutes)
rcpcndata1/2	Consent page completed (twin Perception web study), 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpcntime1/2	Time interval from start to end of consent (twin Perception web study), minutes	derived	perception	decimal	quantitative	approx 0 to 5 (minutes)
rcpcrclnt1/2	Cars test Clean score (twin Perception web study), 0-30	item	perception	integer	scale value	0 to 30
rcpcrdata1/2	Cars test completed (twin Perception web study), 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpcrdegt1/2	Cars test Degraded score (twin Perception web study), 0-24	item	perception	integer	scale value	0 to 24
rcpcrmemt1/2	Cars test Memorisation score (twin Perception web study), 0-18	item	perception	integer	scale value	0 to 18
rcpcrt1/2	Cars test total score (twin Perception web study), 0-72	item	perception	integer	scale value	0 to 72
rcpcrtime1/2	Time interval from start to end of Cars test (twin Perception web study), minutes	derived	perception	decimal	quantitative	approx 4 to 30 (minutes)
rcpcrtmd1/2	Cars test median item response time (twin Perception web study), seconds	derived	perception	decimal	quantitative	approx 0 to 10 (seconds)
rcpcrXXXXr1/2 (XXXX is the item code for each of the 72 items)	Cars test item XXXX response (twin Perception web study), 1 to 3	item	perception	integer	nominal	1/2/3 (image selected)
rcpcrXXXXs1/2 (XXXX is the item code for each of the 72 items)	Cars test item XXXX score (twin Perception web study), 1=correct 0=incorrect	item	perception	integer	ordinal	0=incorrect, 1=correct
rcpcrXXXXt1/2 (XXXX is the item code for each of the 72 items)	Cars test item XXXX response time (twin Perception web study), milliseconds	item	perception	integer	quantitative	approx 0 to 2000 (milliseconds)
rcpdata	Perception web study data present (either twin), 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpdata1/2	Twin Perception web study activity data present, 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpfcclnt1/2	Faces test Clean score (twin Perception web study), 0-30	item	perception	integer	scale value	0 to 30
rcpfcdata1/2	Faces test completed (twin Perception web study), 1Y 0N	item	perception	integer	nominal	0=no, 1=yes
rcpfcdegt1/2	Faces test Degraded score (twin Perception web study), 0-24	item	perception	integer	scale value	0 to 24
rcpfcmemt1/2	Faces test Memorisation score (twin Perception web study), 0-18	item	perception	integer	scale value	0 to 18
rcpfct1/2	Faces test total score (twin Perception web study), 0-72	item	perception	integer	scale value	0 to 72
rcpfctime1/2	Time interval from start to end of Faces test (twin Perception web study), minutes	derived	perception	decimal	quantitative	approx 4 to 30 (minutes)
rcpfctmd1/2	Faces test median item response time (twin Perception web study), seconds	derived	perception	decimal	quantitative	approx 0 to 8 (seconds)
rcpfcXXXr1/2 (XXX is the item code for each of the 72 items)	Faces test item XXX (twin Perception web study), response1 to 3	item	perception	integer	nominal	1/2/3 (image selected)
rcpfcXXXs1/2 (XXX is the item code for each of the 72 items)	Faces test item XXX score (twin Perception web study), 1=correct 0=incorrect	item	perception	integer	ordinal	0=incorrect, 1=correct
rcpfcXXXt1/2 (XXX is the item code for each of the 72 items)	Faces test item XXX response time (twin Perception web study), milliseconds	item	perception	integer	quantitative	approx 0 to 2000 (milliseconds)
rcpLLCage1	Age of twin on starting Perception web study activities (for use in LLC TRE), months	derived	perception	integer	quantitative	approx. 215 to 240 (months)
rcpLLCdate1	Date on starting Perception web study activities (for use in LLC TRE), yyyy-mm string	derived	perception	string	date value	approx. '2013-06' to '2014-01'
rcpnact1/2	Number of Perception web study activities completed (Faces, ASP, Cars), 0-3	item	perception	integer	ordinal	0 to 3 (number of activities)
rcptime1/2	Total time spent on all activities (twin Perception web study), minutes	derived	perception	decimal	quantitative	approx 10 to 60 (minutes)
rcpwave	Wave of Perception web study, 1pilot 2main study	item	admin	integer	nominal	1=pilot study, 2=main study
rcqage1/2	Age of twin on return of 18 year questionnaire	derived	admin	decimal	quantitative	approx 18 to 19 (years)
rcqalage1/2	Estimated age when A-levels or post-16 exams were taken at age 18, years	derived	qnr	decimal	quantitative	approx. 17.8 to 18.8
rcqalgrdm1/2	Mean grade for full A levels (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalLLCage1	Estimated age of twin when A-levels or post-16 exams were taken at age 18 (for use in LLC TRE), months	derived	admin	integer	quantitative	214 to 225 (months)
rcqalLLCdate1	Estimated date when A-levels or post-16 exams were taken at age 18 (for use in LLC TRE), yyyy-mm string	derived	admin	string	date value	'2012-06' to '2015-06'
rcqaln1/2	Number of full A level results reported (twin qnr at 18), 0-6	derived	qnr	integer	quantitative	0 to 6
rcqalpsct1/2	Total point score for full A levels (twin qnr at 18), 0-36	derived	qnr	decimal	scale	0 to 36
rcqalsenggrdm1/2	English mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalsgrdm1/2	Mean grade for combined A and AS levels (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalshumgrdm1/2	Humanities subjects mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalslangrdm1/2	Language subjects mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalsmatgrdm1/2	Maths mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalspsct1/2	Total point score for combined A and AS levels (twin qnr at 18), 0-36	derived	qnr	decimal	scale	0 to 36
rcqalsscigrdm1/2	Science subjects mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalstecgrdm1/2	Technology subjects mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqalsvocgrdm1/2	Vocational subjects mean grade in A and AS level results (twin qnr at 18), 1-6	derived	qnr	decimal	scale	1 to 6
rcqasn1/2	Number of AS level results reported (twin qnr at 18), 0-6	derived	qnr	integer	quantitative	0 to 6
rcqback11/2	Background item 1: main activity last 12 months (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=studying, 2=working, 3=apprenticeship/training, 4=gap year, 5=unemployed, 6=parent
rcqback21/2	Background item 2: main activity next 12 months (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=studying, 2=working, 3=apprenticeship/training, 4=gap year, 5=unemployed, 6=parent
rcqback31/2	Background item 3: where living next 12 months (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=with parents, 2=college during term, 3=own address, 4=overseas/other
rcqdata	18 Year questionnaire data present (either twin), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqdata1/2	Twin questionnaire data present at 18, 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqdipgrd1/2	Level 3 Diploma grade (twin qnr at 18), see value labels	item	qnr	integer	ordinal	1=E, 2=D, 3=C, 4=B, 5=A, 6=A* for Diplomas; 1=P, 3=M, 5=D, 6=D* for BTEC
rcqdipsub1/2	Level 3 Diploma subject (twin qnr at 18), see value labels	item	qnr	integer	nominal	see value labels for list
rcqdiptyp1/2	Level 3 Diploma type (twin qnr at 18), see value labels	item	qnr	integer	nominal	see value labels for list
rcqdipval1/2	Level 3 Diploma value (twin qnr at 18), number of A-level equivalents	item	qnr	integer	ordinal	0.5, 1, 2 or 3 (number of A level equivalents)
rcqemp1/2	Permanent job or apprenticeship (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=no: at university or unemployed, 2=no: gap year, 3=yes: permanent job, 4=yes: apprenticeship
rcqempft1/2	Full or part time job (twin qnr at 18), 1=FT 2=PT	item	qnr	integer	nominal	1=full time, 2=part time
rcqempsoc1/2	Approximate SOC level for job (twin qnr at 18), 1 to 9	item	qnr	integer	ordinal	1 to 9 (SOC levels)
rcqempst1/2	When did job start (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=not yet, 2=over a year ago, 3=within last year
rcqepqgrd1/2	EPQ (Extended Project) grade (twin qnr at 18), see value labels	item	qnr	integer	ordinal	1=E, 2=D, 3=C, 4=B, 5=A, 6=A*
rcqhe1/2	Entering university or HE (twin qnr at 18), see value labels	item	qnr	integer	nominal	0=no, 1=yes
rcqhectyp1/2	General type of university/HE course (twin qnr at 18), see value labels	item	qnr	integer	nominal	see value labels for list
rcqhefbrs1/2	Finance for university/HE studies: university bursary or scholarship (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqhefemp1/2	Finance for university/HE studies: help from employer (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqhefgrn1/2	Finance for university/HE studies: government grant or funding (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqhefmnt1/2	Finance for university/HE studies: maintenance loan (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqhefpar1/2	Finance for university/HE studies: help from parent (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqheftui1/2	Finance for university/HE studies: tuition fees loan (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqhefwrk1/2	Finance for university/HE studies: part time work (twin qnr at 18), 1Y 0N	item	qnr	integer	nominal	0=no, 1=yes
rcqheityp1/2	Type of university/HE institution where place accepted (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=UK university, 2=overseas university, 3=HE college
rcqheqtyp1/2	Qualification type for HE/FE course (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=Batchelors/Masters degress, 2=Foundation course, 3=HNC/HND, 4=CertHE/DipHE, 5=Level 4 BTEC/NVQ, 6=other
rcqhesttm1/2	When HE/FE course starts (twin qnr at 18), 1=this year 2=next year	item	qnr	integer	nominal	1=last academic year or earlier, 2=this academic year, 3=next academic year (deferred entry)
rcqheuni1/2	UK university where place accepted (twin qnr at 18), see value labels	item	qnr	integer	nominal	see value labels for list
rcqLLCage1	Age of twin when twin 18 year questionnaire was returned (for use in LLC TRE), months	derived	admin	integer	quantitative	approx. 216 to 234 (months)
rcqLLCdate1	Date when twin 18 year questionnaire was returned (for use in LLC TRE), yyyy-mm string	derived	admin	string	date value	approx. '2012-08' to '2015-01'
rcqnvqsub1/2	Level 3 NVQ subject (twin qnr at 18), see value labels	item	qnr	integer	nominal	see value labels for list
rcqothqual1/2	Other type of post-16 qualifications (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=Scottish Highers, 2=Welsh Baccalaureate, 3=International Baccalaureate, 4=any overseas qualifications, 5=UK qualifications at level 1/2, 6=other UK qualifications at level 3, 7=A/AS levels with unspecified grades
rcqqstatus1/2	Post-16 qualification status (twin qnr at 18), see value labels	derived	qnr	integer	nominal	0=no post-16 quals, 1=post-16 studies still unfinished, 2=finished with A/AS levels, 3=finished with A/AS levels plus other quals, 4=finished with other quals but not A/AS levels
rcqqual1/2	Post-16 studies completed (twin qnr at 18), see value labels	item	qnr	integer	nominal	1=yes, 2=no: continuing for another year, 3=no: continuing for at least two more years, 4=no, have not studied post-16
rcqucast1/2	UCAS point score total estimate from known UK exam results (twin qnr at 18)	derived	qnr	decimal	scale value	approx 0 to 800
rcqsctypg1/2	School type during GCSEs, best estimate (twin qnr at 18), see value labels	derived	qnr	integer	nominal	0=other, 1=state non-selective, 2=private, 3=grammar, 4=special, 5=home educated