Table 1. Descriptive statistics.

	Sunshine High (n = 2,104)			Jefferson High (n = 1,024)
Network statistics	t1	t2	t3	t1	t2	t3
Out-going ties	5,685	4,201	2,296	6,063	3,713	2,484
Reciprocity index	0.30	0.28	0.25	0.34	0.35	0.35
Transitivity index	0.19	0.19	0.14	0.18	0.19	0.20
Jaccard index	0.16		0.16	0.22		0.21
Limited nominations (%)	0	3.49	1.52	0	4.82	0.41
Smoking (past 30 days, %)
0 = never	68.60	78.28	71.76	42.01	53.17	45.39
1 = 1-3days	17.54	7.44	9.37	21.31	9.12	11.68
2 = 4–21 days	4.91	7.07	8.91	9.02	11.58	10.55
3 = 22 or more days	8.95	7.21	9.97	27.66	26.13	32.38
Alcohol use (past 12 months, %)
0 = never	44.03	51.56	53.76	30.53	34.32	37.60
1 = 1 or 2 days	26.54	19.19	14.83	23.46	19.77	13.73
2 = once a month or less (3–12 times in the past 12 months)	8.59	12.35	11.11	12.70	18.55	15.98
3 = 2 or 3 days a month	6.66	6.06	6.80	13.63	14.34	14.04
4 = more than 1 or 2 days a week	14.19	10.84	13.50	19.67	13.01	18.65
Marijuana use (past 30 days, %)
0 = never	83.05	73.00	62.63	77.15	69.77	61.07
1 = 1–10 times	7.76	14.78	20.71	10.14	18.03	20.49
2 = 11 or more times	9.18	12.21	16.67	12.70	12.19	18.44
Response rate (%)	76.05	81.80	74.80	78.61	81.25	74.01
Female (%)	47.52			48.46
Grade level (%)
7th grade	0.00			0.00
8th grade	0.00			0.00
9th grade	0.00			28.79
10th grade	37.23			28.48
11th grade	33.43			21.72
12th grade	29.34			21.00
Parent education level (%)
Less than high school	21.67			5.23
High school	30.62			38.32
Some college or trade school	28.79			36.48
Graduate of college/university	18.92			19.98
Depressive symptom, mean (SD)	0.14(0.53)			0.00(0.53)
Parental support, mean (SD)	-0.05(0.30)			-0.04(0.29)
Parental monitoring, mean (SD)	-0.01(0.12)			-0.04(0.10)