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

Published in final edited form as: J Subst Abuse Treat. 2010 Jul 29;39(3):255–263. doi: 10.1016/j.jsat.2010.06.007

Table 3.

Stimulant and Alcohol Use at Baseline and Follow-Up Evaluations

Variable	Cocaine		Amphetamine		Methamphetamine		Alcohol		Level 1 TES^a

	Control (N=67)	CM (N=64)	Control (N=67)	CM (N=64)	Control (N=67)	CM (N=64)	Control (N=67)	CM (N=64)	Control (N=67)	CM (N=64)
Joint Probability Index^b
Baseline	0.81	0.78	0.73	0.75	0.67	0.73	0.94	0.94	0.52	0.52
7-Month Follow-up	0.51	0.55	0.46	0.52	0.49	0.52	0.96	0.98	0.36	0.39
9-Month Follow-up	0.48	0.70^*	0.37	0.55	0.39	0.56	0.97	0.95	0.27	0.47^*
12-Month Follow-up	0.58	0.75	0.46	0.70^*	0.48	0.69^*	0.96	0.98	0.36	0.61^*

Level 1 TES Score: Cocaine, Amphetamines, Methamphetamines, PCP & Alcohol Metabolite-Free

Joint probability index: proportion of participants that provided drug-free urine samples at a specified time point divided by number of participants randomized to that condition.

p<0.05 between CM and control groups