Table 1.
HF | LF | Sham | |
---|---|---|---|
Age (in years): mean (SD) | 42 (7) | 44 (5) | 44 (6) |
Gender (male/female): n | 6 M | 6 M | 5M/1F |
Ethnicity: n | 4AA/1C/1H | 6AA | 6AA |
Years of cocaine use: mean (SD) | 19 (9) | 21 (9) | 20 (9) |
Weekly spending on cocaine (US$): mean (SD) | 292 (157) | 388 (305) | 210 (102) |
HF, high frequency; LF, low frequency; M, male; F, female; AA, African–American; C, Caucasian; H, Hispanic.