Table 1.
Participant Characteristics
| Measure | Early onset (n=15)mean (SEM) | Late onset (n=26)mean (SEM) | p |
|---|---|---|---|
| Age | 29.0 (2.0) | 28.7 (1.4) | 0.91 |
| Sex (% male) | 40% | 73% | χ2p=0.04 |
| Ethnicity (% African American) | 73% | 77% | χ2p=0.41 |
| Education (Years) | 12.5 (0.4) | 13.1 (0.3) | 0.20 |
| Age of onset of cannabis use | 13.1 (0.6) | 19.5 (0.8) | 0.00 |
| Gram years (lifetime use) | 38.0 (23.5) | 28.3 (34.0) | 0.35 |
| Cannabis craving | 44.9 (3.7) | 39.0 (3.0) | 0.23 |
| Substance use in the last 30 days | |||
| Cannabis grams daily | 3.3 (0.5) | 3.5 (0.9) | 0.85 |
| # EtOH days | 2.1 (0.9) | 4.0 (0.9) | 0.15 |
| # EtOH drinks per day | 5.7 (2.4) | 4.1 (0.6) | 0.53 |
| # Cigarette days | 17.0 (3.7) | 12.3 (2.8) | 0.32 |
| # Cigarettes per day | 2.5 (0.7) | 2.9 (0.7) | 0.71 |
SEM, standard error of mean.