Table 1.
Participant characteristics and substance-use histories
| Variable | Non-MJ users (n = 65) M (SD) or % | MJ users (n = 65) M (SD) or % |
| Age | 17.71 (0.93) | 17.96 (0.90) |
| Female, % | 25% | 25% |
| White, % | 66% | 68% |
| Family history positive for SUD, % | 23% | 33% |
| Parent annual salary, U.S. $, in thousands | 111.22 (77.78) | 124.48 (118.8) |
| WRAT-3 reading standard score | 108.6 (7.6) | 106.5 (7.9) |
| WASI Vocabulary T score | 58.6 (9.3) | 57.3 (8.5) |
| Grade point average* | 3.34 (0.56) | 3.10 (0.73) |
| Beck Depression Inventory total | 2.26 (2.86) | 3.45 (4.38) |
| Spielberger State Anxiety T-Score | 37.37 (7.74) | 39.07 (7.19) |
| Lifetime marijuana use occasions** | 1.06 (2.11) | 500.65 (398.91) |
| Marijuana use days per month** | 0.08 (0.32) | 16.03 (10.19) |
| Days since last marijuana use (min. = 22 days)a,** | 402.71 (311.65) | 52.92 (67.36) |
| Lifetime drinking occasions** | 22.32 (38.42) | 203.28 (166.33) |
| Days since last alcohol use (min. = 13 days)a,** | 413.71 (439.12) | 42.97 (61.86) |
| Lifetime alcohol hangover/withdrawal symptoms** | 0.66 (1.18) | 2.32 (2.22) |
| Lifetime other drug use occasions** | 0.29 (1.66) | 9.31 (12.57) |
| Days smoked cigarettes in past month** | 0.35 (2.49) | 5.72 (10.30) |
Notes: MJ = marijuana; SUD = substance-use disorder; WRAT-3 = Wide Range Achievement Test, Third Edition; WASI = Wechsler Abbreviated Scale of Intelligence; min. = minimum.
a
For participants who have used this substance.
*
p < .05;
**
p < .01.