Table 1.

Measures common to the other Center for Analysis of Pathways from Childhood to Adulthood (CAPCA) studies included in this supplement, by age and domain.

Domain
Parental socio-economic status	Mother's education in 1984: 1 = grade school (8%), 3 = high school (44%), 5 = college (10%), 8 = PhD (3%)
Family relations	Family conflict at ages 12 (α = 0.65) and 18 (α = 0.68), 3 items: ‘I have a lot of fights with my parents about their rules and decisions for me’ (1 = never true, 4 = always true)
Peer relations	Difficulty making friends at age 12, 3 items: e.g. ‘How hard is it for you to make friends?’ (1 = very easy, 7 = very hard), α = 78
	At age 18, 2 items: e.g. ‘How hard is it for you to make friends?’ (1 = very easy, 7 = very hard), α = 79
Academic achievement	Grade point average (from school records): at age 12(1 = F, 16 = A+); at age 18 (0 = F, 4 = A)
Truancy	Skipped school at age 12, 1 item: ‘Since past January, how many times have you not come to school when you were supposed to?’ (0-12 times)
	At age 18, 1 item: i.e. ‘How often in the past 6 months did you skip school?’ (0-12 times)
Future expectations	College plan at age 12, 1 item: ‘Do you plan to go to college after high school?’ (1 = no, 2 = I don't know, 3 = yes)
	At age 18, 1 item: ‘When you think about the future, how likely do you think it is that you will graduate from college (4-year college)?’ (1 = very unlikely, 7 = very likely)
Externalizing	Aggression at age 12, 3 items: e.g. ‘In last 3 weeks at school how many times did you punch or push another student?’ (0 = never to 12 or more times), α = 0.70
	At age 18, 5 items: e.g. ‘About how often in the last 6 months did you get into a fist fight with another kid?’ (1 = never, 7 = 21 or more), α = 0.72
Substance use	Bring alcohol or drugs to school at age 12, 1 item: ‘In the last 3 weeks at school how many times did you bring alcohol or drug to school?’ (0-12 or more)
	Alcohol use at age 18, a composite of general and heavy alcohol use: e.g. ‘How often in past 6 months did you get drunk?’ (1 = never, 7 = 21 times or more), α = 0.95
	Other drug use at age 18, 3 items: e.g. ‘How often in the past 6 months did you use chemicals/drugs other than marijuana/alcohol?’ (1 = never, 7 = 21 or more), α = 0.75
Age 21/28 alcohol use	General alcohol use at ages 21 and 28, 1 item: ‘How often in the past 6 months did you drink alcohol?’ (1 = never, 2 = once, 3 = 2-3 times, 4 = 4-6 times, 5 = 7-10 times, 6 = 11-20 times, 7 = 21 or more)
	Heavy alcohol use at ages 21 and 28, 1 item: ‘How often in the past 6 months did you get drunk?’ (1 = never, 2 = once, 3 = 2-3 times, 4 = 4-6 times, 5 = 7-10 times, 6 = 11-20 times, 7 = 21 or more)

α, coefficient alpha.