Table 2.

Linear regression examining predictors of substance use problems.

Variable	b	SE	β	t-value	ΔR2
Step 1:					0.41***
Sex (Male)	0.81	1.87	0.03	0.43
Age	0.26	0.08	0.22	3.35**
Income	−0.33	0.34	−0.06	−0.98
Current Posttraumatic Stress Disorder	4.03	3.73	0.07	1.08
Current Generalized Anxiety Disorder	0.55	3.27	0.01	0.17
Current Alcohol Dependence	2.36	1.85	0.08	1.27
Current Cannabis Dependence	−6.02	2.77	−0.14	−2.17*
Current Cocaine Dependence	4.27	1.93	0.15	2.21*
Antisocial Personality Disorder	1.43	1.87	0.05	0.76
PASAT-C Quit	−2.14	2.01	−0.06	−1.07
BDI Depressive Symptoms	0.30	0.11	0.22	2.84**
BAI Anxiety Symptoms	0.18	0.08	0.16	2.24*
Eysenck Impulsivity	−0.46	0.21	−0.15	−2.15*
Step 2:					0.00
Gender x BDI Depressive Symptoms	0.03	0.17	0.02	0.18
PASAT-C Quit x BDI Depressive Symptoms	−0.06	0.24	−0.02	−0.25
Gender x PASAT-C Quit	−2.62	4.33	−0.06	−0.61
Step 3:					0.02**
Gender x PASAT-C Quit x BDI Depressive Symptoms	−1.34	0.51	−0.30	−2.62**

^*p < .05,

^**p < .01,

^***p < .001.