Table 4.

Hierarchical Regression Analyses on Adolescent Reports of Own Alcohol Use Days and Marijuana Use Days on Demographic, Treatment Status, and Parent Situation Inventory (PSI) Measures

	Alcohol use daysa		Marijuana use daysb
Variable	R2	β	R2	β
Background	.05		.05
Adolescent gender		.24		.12
Parent years of education		.14		−.01
Parent race		.13		.18
Treatment group	.06	−.01	.06	.07
Parent substance use daysc	.06	−.09	.09	.13
PSI	.14*f		.14g
Similarityd		−.20		.17
Skillfulnesse		−.32**		−.15

Note. Significance levels in R² columns reflect significance of R² change; beta values are for the final, full regression model. Adolescent gender was coded as 1 (male) or 2 (female). Parent race was coded as 1 (White) or 2 (non-White). Treatment group was coded as 1 (adolescent in treatment) or 2 (adolescent not in treatment).

^aProportion of previous 180 days that adolescent reported using alcohol.

^bProportion of previous 180 days that adolescent reported using marijuana.

^cProportion of previous 180 days that parent reported using alcohol or an illicit drug.

^dMean situation similarity 1 (not similar at all) to 5 (extremely similar) of PSI situations.

^eMean situation skill level (potential range 1 [worst] to 6 [best]) on PSI situations.

^fOverall F(7, 64) = 1.53, ns.

^gOverall F(7, 65) = 1.45, ns.

^*p < .10.

^**p < .05.