Table 1.

Participant characteristics.

	Methamphetamine (N = 63)		Cocaine (N = 29)
	N	%	N	%	Chi-square p-value
Relapse	18	28.6	17	58.6	0.006
Male	48	76.2	25	86.2	0.270
VA patienta	43	68.3	22	75.9	0.457
Generalized anxiety disorder	3	4.8	0	0	0.232
Major depressive disorder	2	3.2	0	0	0.332
Alcohol dependence	20	31.8	9	31.0	0.792
Cannabis dependence	13	20.6	9	31.0	0.277
Opioid dependence	2	3.2	5	17.2	0.018
	Median	IQR	Median	IQR	Mann-Whitney p-value
Age	37	18	46	12.5	0.040
Verbal IQ	109	13	105	15	0.031
Years of education	12	2	13	3	0.252
Days since last use	27	14	30	15.5	0.323
Cigarettes/day	15	12	10	20	0.147
Lifetime uses of cocaine	150	2298	6752	19,192	<0.001
Lifetime uses of methamphetamine	5195	9900	0	128.5	<0.001

Bold font indicates p < .05.

^aParticipants were recruited from either a Veterans Affairs treatment program or a community hospital's treatment program.