Table 1.

Descriptive Statistics for Study Variables

Covariates		N		N
Gender			Race
	Female	181	Caucasian	520
	Male	384	Non-Caucasian	45
Family income (wave 2)
	under $4,000	7	$16,001–$20,000	23
	$4,000–$7,000	1	$20,001–$30,000	72
	$7,001–$10,000	6	$30,001–$50,000	145
	$10,001–$13,000	13	$50,001–$75,000	102
	$13,001–$16,000	25	$75,001–$100,000	32
			over $100,000	16

	N	Min	Max	Mean	SD
BMI at different age points
Ages 8–10	249	10.81	30.12	18.54	3.84
Ages 11–12	270	12.48	34.02	20.17	4.27
Ages 13–14	260	15.11	33.87	21.24	4.08
Ages 15–16	251	16.18	35.61	22.65	4.22
Ages 17–18	230	17.38	38.60	24.12	4.74
Ages 19–21	239	16.30	38.07	24.10	4.14
Substance use (age 21–23)

Binge drinking days last year		N (%)		N (%)
	None	108 (32%)	120–149 days	7 (2%)
	1–29 days	84 (25%)	150–179 days	15 (5%)
	30–59 days	31 (12%)	180–209 days	10 (3%)
	60–89 days	32 (10%)	210–239 days	7 (2%)
	90–119 days	13 (4%)	240–269 days	7 (2%)
			270+ days	11(3%)
Frequency of marijuana smoked last year		N (%)		N (%)
	Never	212 (38%)	20–39 times	14 (3%)
	1–2 times	33 (6%)	40–99 times	15 (3%)
	3–5 times	11 (2%)	100–249 times	13 (2%)
	6–9 times	6 (1%)	250–499 times	21 (4%)
	10–19 times	11 (2%)	500+ times	13 (2%)
Frequency of cigarette smoking last year		N (%)		N (%)
	Never	164 (29%)	Regularly for part of the year	28 (5%)
	1–2 times	29 (5%)	Regularly	85 (15%)
	Occasionally, not regularly	43 (8%)

Outcome variables (age 21–23)
Nicotine dependence	329	0	5	.93	1.12
Number of drinking problems	337	.00	23.87	4.27	4.91
Number of illicit drug problems	337	.00	11.85	.25	1.12