Table 2.

Demographics and clinical characteristics of cocaine-dependent (CD) and healthy control subjects.

	CD patients (n = 36)				Healthy comparison subjects (n = 50)
	Male		Female		Male		Female
	n	%	n	%	n	%	n	%
Sex	18	50.0	18	50.0	28	56.0	22	44.0
Caucasian	8	22.2	7	19.4	18	36.0	10	20.0
African-American	9	25.0	11	30.6	4	8.0	9	18.0
Hispanic	1	2.8	0	0.0	4	8.0	3	6.0
Asian	0	0.0	0	0.0	2	4.0	0	0.0
Lifetime prevalence of alcohol dependence	8	44.4	4	22.2	–	–	–	–
Number of smokers*	14	77.8	15	83.3	4	14.3	3	10.7
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Age** (years)	38.22	5.38	36.67	5.63	30.86	9.74	31.50	8.27
Estimated IQ***	110.28	11.17	105.00	10.32	115.46	7.56	115.14	6.71
Recent cocaine use
Days cocaine use last 90 days	46.78	23.50	45.72	25.12	–	–	–	–
Total cocaine use last 90 days	47.50	42.71	48.55	55.28	–	–	–	–
Mean cocaine use per use last 90 days	1.22	1.50	1.11	0.76	–	–	–	–
Years of cocaine use	11.53	6.47	8.89	6.52	–	–	–	–
Recent alcohol use
Days of alcohol use past 30 days+/+++	8.11	8.07	12.61	8.32	5.54	6.29	2.32	3.05
Amount of alcohol use past 30 days (drinks/mth)++	87.43	117.45	129.14	111.97	9.95	9.04	3.77	6.53

^*Cocaine subjects > comparison subjects, chi-square (1) = 38.10, P < 0.001.

^**Cocaine subjects > comparison subjects, t(84) = 3.72, P < 0.001.

^***Cocaine subjects < comparison subjects, t(84) = −3.94, P < 0.001.

⁺Cocaine subjects > comparison subjects, t(84) = 4.21, P < 0.001.

⁺⁺Cocaine subjects > comparison subjects, t(65) = 5.21, P < 0.001.

⁺⁺⁺Healthy comparison men > healthy comparison women, t(48) = 2.20, P = 0.033.