Table 1.

Demographics of the subjects.

Subject characteristic	CD (n = 70)	HC (n = 70)	p-value
Age (years)	40.7 ± 7.7	38.5 ± 9.4	0.14*
Gender (M/F)	52/18	46/24	0.28∧
Current cigarette smokers/non-smokers	51/19	21/49	<0.001∧
Years of alcohol use	18 ± 9.0	19 ± 11.7	0.48*
Amount of average monthly cocaine use (gm) in the prior year	26.1 ± 32.0	N/A	N/A
Average cocaine amount per use (gm)	1.4 ± 1.3	N/A	N/A
Days of cocaine use in the prior month	15.9 ± 9.9	N/A	N/A
Years of cocaine use	19.2 ± 8.0	N/A	N/A

values are mean ± S.D.;

^*two-tailed two-sample t-test;

^∧χ² test.