TABLE 1.

Demographics and clinical measures of the subjects

Subject characteristic	CD (n = 52)	HC (n = 52)	p value
Age (years)	44.9 ± 7.2	44.0 ± 8.8	0.54a
Gender (M/F)	42/10	39/13	0.48b
Years of drinking	26.8 ± 10.8	26.1 ± 11.1	0.74a
Years of smoking	17.5 ± 11.4	2.0 ± 6.5	<0.001a
CCQ score	41.8 ± 15.1	N/A	N/A
CSSA score	30.3 ± 20.1	N/A	N/A
Monthly cocaine use (g, average, prior year)	28.2 ± 26.8	N/A	N/A
Cocaine amount per use (g, prior month)	1.3 ± 1.0	N/A	N/A
Days of cocaine use (prior month)	19.6 ± 8.7	N/A	N/A
Years of cocaine use	16.9 ± 9.5	N/A	N/A

Note: values are mean ± S.D.

Abbreviations: CCQ: Cocaine Craving Questionnaire; CSSA: Cocaine Selective Severity Assessment; CD, cocaine dependent; HC, healthy control.

^aTwo-tailed two-sample t test.

^bχ² test.