Table 1.

Demographic and drug use characteristics of participants at baseline by randomization status.

Variable	d-Amphetamine n = 22		Modafinil n = 20		Modafinil and d-amphetamine n = 15		Placebo n = 16
	N	%	N	%	N	%	N	%
Male	21	95.5	16	84.2	11	73.3	14	87.5
White	6	27.3	6	31.6	3	20.0	2	12.5
Black	15	68.2	12	63.2	10	66.7	10	62.5
Hispanic	1	4.6	1	5.3	2	13.3	3	18.8
Employment (unemployed)	16	72.7	13	68.4	10	71.4	5	31.3
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Age	44.3	6.5	42.6	8.3	41.2	8.5	41.9	9.0
Education (years)	12.7	1.6	12.9	1.5	13.2	2.0	13.5	1.8
Cocaine use (past 30 days)	17.1	8.8	16.4	8.6	20.5	7.3	17.7	9.6
Lifetime cocaine (years)	12.9	8.1	12.4	7.5	13.9	8.0	15.5	7.4
Alcohol use (past 30 days)	10.6	10.8	10.8	9.9	6.4	9.0	10.1	8.5
Lifetime alcohol (years)	20.5	11.3	17.8	11.4	16.5	13.9	19.5	12.9