Table 1. Subject Characteristics by Group.

Characteristic	Abstinent		Relapsed
	N	%	N	%
Participants	45		18
Female	11	23	4	21
White	24	51	12	63
Black	5	11	3	16
Hispanic	17	35	4	21
Asian	1	2	2	11
Alcohol dependencea	18	37	10	53
Marijuana dependencea	8	17	5	26
Cocaine dependencea	13	27	7	37
Cocaine dependenceb	5	10	4	21
Alcohol dependenceb	8	17	6	32
Marijuana dependenceb,c	2	4	4	21

	Mean	SD	Mean	SD
Age (years)	38.8	11.1	37.4	9.2
Education (years)	12.8	1.7	13.3	1.5
Verbal IQd	108.0	10.2	109.7	7.3
Alcohol (drinks/week)e	11.0	17.6	14.4	33.0
Nicotine (cigarettes/day)e	11.8	9.3	8.7	9.2
Methamphetamine estimated lifetime uses	14 624.5	32 414.1	8841.6	12 353.1
Methamphetamine age onset	24.1	9.4	24.9	9.1
Methamphetamine recent use (days)	35.6	33.2	31.5	16.7
Cocainef,g	2551.4	6116.9	3942.9	7250.8
Marijuanaf	10 882.5	30 375.4	4743.5	8851.2

^aMet criteria for lifetime comorbid dependence with methamphetamine dependence.

^bMet criteria for current comorbid dependence with methamphetamine dependence.

^cp<0.05 based on chi-squared analysis.

^dAssessed by the North American Adult Reading Test (NAART; Uttl, 2002)

^eRecent patterns of use.

^fNumber of uses across the lifespan.

^gp<0.1 based on t-test of natural log-transformed number of uses.