. Author manuscript; available in PMC: 2011 Sep 1.

Published in final edited form as: J Subst Abuse Treat. 2010 Dec 3;40(2):183–188. doi: 10.1016/j.jsat.2010.10.002

Table 2.

Multiple regression analysis of pretreatment substance use, depression, age, and purpose in life predicting of 6 month post-treatment frequency and quantity of substance use

Variable	β	sr²	R² change	R²
Number of cocaine use days
Step 1: Covariates			.05	.05
Age	−.05	−.05
BDI total score	−.02	−.02
Number of pretreatment cocaine use days	.10	.09
Step 2: Purpose in life			.05^**	.10^**
PIL-R	−.29^**	−.23

Number of alcohol use days
Step 1: Covariates			.08^*	.08^*
Age	−.01	−.01
BDI total score	−.18	−.14
Number of pretreatment alcohol use days	.26^**	.25
Step 2: Purpose in life			.06^*	.14^**
PIL-R	−.31^*	−.24

p < .05

^**

p ≤ .01