Table 1.

Baseline and demographics by treatment condition

	47	6.	3	43	8.	3	48	7.	3	46.	7.	9	3.	2,	0.
Age	.4	8	1	.3	3	0	.1	2	2	3	6	3	59	90	03
	86	9.	3	85		2	85	10	3	86.	10	9	0.	2,	0.
Shipley Estimated IQ	.7	9	1	.8	10	8	.4	.8	2	0	.1	1	14	88	87
Days Use in Past 28 Days
	6.	9.	3	7.	7.	2	8.		3		8.	8	0.	2,	0.
Alcohol	9	3	1	9	4	8	9	9	0	7.9	6	9	4	86	68
	18	7.	3	16	7.	2	18	7.	3	17.	7.	9	0.	2,	0.
Cocaine	.5	6	1	.8	6	9	.3	6	0	9	5	0	46	87	63
	3.	7.	3	0.	2.	2	1.	2.	3			8	2.	2,	0.
Marijuana	4	5	1	61	7	8	4	6	0	1.8	5	9	54	86	09
	0.	2.	3	1.	5.	2	0.	1.	3		3.	8	0.	2,	0.
Benzodiazepine	6	6	1	4	2	8	2	0	0	0.7	3	9	88	86	42
			3			2			3			9		2,
Heroin	0	0	1	0	0	9	0	0	0	0	0	0		87
	19	12	3	17	12	2	21	10	3	19.	11	9	0.	2,	0.
Nicotine	.3	.1	1	.7	.4	9	.7	.8	0	57	.8	0	86	87	43
Barratt Impulsivity Scale (BIS-11)
	26	5.	2	27	6.	2		7.	2	26.	6.	7	0.	2,	0.
Non-planning impulsivity	.5	1	8	.7	3	5	26	2	3	7	2	6	52	73	6
	23	4.	2		4.	2	23	4.	2	24.	4.	7	0.	2,	0.
Motor impulsivity	.9	2	8	25	5	5	.8	6	5	2	4	8	56	75	57
	14	3.	2	17		2	16	5.	2	16	4.	7		2,	0.
Cognitive impulsivity	.9	6	7	.7	4	6	.9	3	5	5	4	8	3	75	06
	4.	2.	2	3.	2.	1	3.	2.	2		2.	6	0.	2,	0.
Nicotine dependence: FTND	1	3	2	4	5	9	2	4	2	3.6	4	3	9	60	41
	47	22	3	50	20	2	49	23	2	49.	22	8	0.	2,	0.
Cocaine Withdrawal: CSSA	.7	.8	1	.2	.4	3	.7	.3	7	1	.1	1	1	78	91

Abbreviation: FTND=Fagerstrom Test of Nicotine Dependence, CSSA=Cocaine Selective Severity Assessment

^aIn order to be eligible for the study, participants had to have a cocaine positive urine prior to starting. There were zero positive urines for heroin, oxycodone, amphetamines, or methamphetamines.