Table 2.

Descriptive statistics for outcome measures by psychiatric status^&

Drug and Alcohol Outcome Measures
	ASI Alcohol				ASI Drug				Peak Density				Abstinence (%)
	Low psych		Mod psych		Low psych		Mod psych		Low psych		Mod psych		Low psych	Mod psych
	X	Sd	X	sd	X	sd	X	Sd	X	sd	X	Sd	%	%
Baseline	0.11	0.22	0.29	0.33***	0.07	.10	0.08	0.11**	18.5	13.0	19.7	12.7	21.9	11.9
6-month	0.07	0.14	0.20	0.29***	0.05	.09	0.05	0.09	9.9	12.7	11.7	12.3	42.8	30.0
12-month	0.06	0.13	0.20	0.24***	0.04	.08	0.05	0.09*	8.6	12.3	12.2	13.0	50.4	33.3*
18-month	0.07	0.15	0.17	0.24**	0.04	.07	0.06	0.09*	11.2	13.0	13.2	13.8	43.1	39.6

^&significance reflects ANOVA/Chi2 comparisons between low and moderate psychiatric groups for each outcome at each time point.

^*p < 0.05;

^**p < 0.01;

^***p < 0.001