Table 4.

Hierarchical Regression Analysis for Variables Predicting Adolescent Substance Frequency at three month follow-up (N=90)

Predictors	B	β	t	p	ESa	ΔR2
Step 1						0.302
Baseline SFS	0.48	0.53	5.86	0.000*	0.28
SES	−0.00	−0.23	−2.50	0.014*	0.05
Step 2						0.000
Depression	0.00	0.01	.13	0.899	0.00
Conduct Disorder	−0.00	−0.00	−0.04	0.971	0.00
Step 3						0.000
Depression X Conduct Disorder	0.00	0.02	0.19	0.851	0.00

Note.

^aEffect size measured by squared semi-partial correlations (Type II).

^*p < .05.

SFS = Substance Frequency Scale; DSS = Depressive Symptom Scale; CDS = Conduct Disorder Scale.