Table I.

National Longitudinal Study of Adolescent Health (Add Health, Descriptive Statistics)

Variable	Observed	Mean	SD	Min	Max
Currently working (10+ h/week)	12,229	0.77	0.42	0	1
Earnings last year ($)	14,436	34,137.57	37,521.63	0	920,000
Social program participation	14,414	0.24	0.43	0	1
Diagnosed ADHD	14,436	0.05	0.22	0	1
Early diagnosis	14,426	0.023	0.15	0	1
Late diagnosis	14,426	0.027	0.16	0	1
Years of schooling	14,433	14.28	2.06	8	21
Ever married	14,428	0.50	0.50	0	1
Test score (wave 3)	14,436	101.06	14.09	9	123
Test score missing	14,436	0.19	0.39	0	1
Age (wave 4)	14,436	28.96	1.74	24.25	34.66667
Female	14,436	0.54	0.50	0	1
Hispanic people	14,436	0.16	0.37	0	1
Black people	14,436	0.22	0.41	0	1
Maternal years of education	14,436	13.21	2.24	0	17
Family income as adolescent ($1,000 s)	14,436	46.12	42.27	0	990
Married parents	14,436	0.71	0.42	0	1
Test score (wave 1)	14,436	100.74	14.47	13	146
Rural status	14,436	0.26	0.44	0	1
Missing family information	14,436	0.30	0.46	0	1
Childhood mistreatment scale	14,436	0.00	0.58	−0.46231	4.545121
Ever diagnosed asthma	14,436	0.15	0.36	0	1
Low birth weight	14,436	0.11	0.28	0	1
Ever diagnosed diabetes	14,436	0.03	0.16	0	1
Mistreatment missing	14,436	0.25	0.43	0	1
Low birth weight missing	14,436	0.17	0.38	0	1
Marijuana use (wave 1)	14,436	0.14	0.35	0	1
Obese (wave 1)	14,436	0.07	0.26	0	1
Depressed (wave 1)	14,436	0.08	0.27	0	1
Sexual initiation (wave 1)	14,436	0.39	0.49	0	1
Smoke (wave 1)	14,436	0.25	0.43	0	1
Drink (wave 1)	14,436	0.41	0.49	0	1