Table 1.

Descriptives by arm on the 413 youths available at pretest and 6-year follow-up

	Pretest			6-year follow-up
Variable	CDP M (SD)	CD M (SD)	Control M (SD)	CDP M (SD)	CD M (SD)	Control M (SD)
Gender, female	0.56 (0.50)	0.50 (0.50)	0.57 (0.50)	0.56 (0.50)	0.50 (0.50)	0.56 (0.50)
Age, years	10.80 (0.99)	10.80 (1.00)	10.90 (1.00)	17.40 (1.09)	17.30 (1.17)	17.40 (1.10)
Alcohol use	0.07 (0.51)	0.01 (0.16)	0.06 (0.35)	1.50a (2.65)	1.94a,b (3.75)	3.02b (6.36)
Heavy drinking	0.00 (0.00)	0.01 (0.10)	0.03 (0.20)	0.43 (1.03)	0.73 (2.58)	1.05 (3.12)
Cigarette use	0.14 (1.64)	0.08 (1.11)	0.04 (0.42)	0.60a (3.06)	2.72b (7.79)	3.20b (8.53)
Marijuana use	0.03 (0.41)	0.00 (0.00)	0.03 (0.40)	2.33 (7.23)	2.41 (7.15)	2.50 (7.27)
Refusal skills§	1.62a,b (0.90)	1.51a (0.79)	1.80b (0.94)	2.64a,b (1.51)	2.41a (1.64)	2.94b (1.70)
Peer alcohol use†	1.11 (0.38)	1.10 (0.57)	1.21 (0.57)	2.22 (0.80)	2.23 (0.86)	2.35 (0.96)

Notes: CDP = CD-ROM and parent component arm; CD = CD-ROM only arm. Sample sizes are 130, 152, and 131, for CDP, CD, and control arm, respectively. Mean substance-use scores represent number of occasions of past-month use. Means with different subscripts differ at p < .05 across arms and within measurement occasions.

^§Six-point scale, lower scores are better;

^†four-point scale, lower scores are better.