Table 1.

Subject Demographics

Age	41 ± 7 years
Race/ Ethnicity	7 African American, 3 European American, 1 Hispanic
Gender	8 Males, 3 Females
Frequency of cocaine use (last month)	4 days per week
Amount of cocaine use (last month)	$235 ± 188 (3-4 grams in current market prices) per day. 4 subjects used $400 or more per day.
Lifetime cocaine use	22 ± 8 years
Initial age of first cocaine use	19±4 years old
Alcohol use (per week)	17 ± 15 drinks (higher use subjects (N=4) had 34 ± 8 drinks per week)
Cannabis use (per month)	< 1 joint (5 subjects denied cannabis use)
Abstinence since last cocaine use (days)	11 ± 7 days
Education	11 completed high school (HS) 2 with further post-HS education

^*Mean ± SD