Table 3. Demographic Characteristics of Participants.
| Placebo | Naltrexone | |
|---|---|---|
| Number of participants | 28 (26 M and 2 F) | 23 (18 M and 5 F) |
| Race (Black/White/Mixed) | 22/4/2 | 15/7/1 |
| Ethnicity (Hispanic/non-Hispanic) | 3/25 | 5/18 |
| Age (years) | 31.6±8.0 | 28.6±7.0 |
| Cannabis use (no. of days/week) | 6.3±1.0 | 6.4±1.0 |
| Cannabis cigarettes/day | 6.0±4.0 | 5.5±3.6 |
| Years daily cannabis use | 12.7±7.9 | 11.1±8.6 |
| Alcohol drinkersa (%) | 46 | 43 |
| Alcohol drinks/week | 8.6±10.8 | 12.3±15.7 |
| Education (years) | 12.5±1.6 | 12.4±1.6 |
Data are presented as means (±SD) or as frequency.
a
Alcohol drinkers are defined as those reporting at least one drink per week. Participants reported no current drug use other than cannabis and possibly tobacco and alcohol.