Table 1.
Demographic characteristics at 3-year follow-up unless otherwise noted.
| Alcohol initiators (ALC) (n = 8) Mean (SD) | Marijuana initiators (MJ) (n = 8) Mean (SD) | |
|---|---|---|
| 21.2 (19.9–22.1) | 20.6 (19.7–22.7) | |
| Age (SD; range) at baseline | 18.2 (0.7; 16.9–18.8) | 17.5 (0.8; 16.6–19.0) |
| % Caucasian | 75% | 63% |
| GPA at 3-year follow-up | 3.3 (0.6) | 3.1 (0.3) |
| Household Income at 3-year follow-up | 105.9K (57.3) | 163.3K (124.7) |
| Family history alcohol use disorder | 38% | 50% |
| Family history substance use disorder | 25% | 62% |
| Alcohol, lifetime use days at baseline (SD: range) | 26.3 (20.5; 3–60) | 37.1 (33.2; 0–85) |
| Alcohol, days use over follow-up (SD; range) | 205.9 (74.7; 131–312) | 295.0 (197.0; 100–625) |
| Binge Drinking Episodes over follow-up | 88.1 (71.2) | 156.3 (157.4) |
| Marijuana, lifetime use days at baseline (SD; range) | 1.0 (2.1; 0–6) | 3.6 (3.5; 0–9) |
| Marijuana, days use over follow-up (SD; range) * | 3.0 (3.7; 0–10) | 369.1 (168.3; 33–540) |
| Other drug use, lifetime use at baseline (SD; range) | 1.0 (0.7; 0.0–2.0) | 1.9 (4.5; 0.0–13.0) |
| Other drug use, days use over follow-up (SD; range) | 1.0 (0.3; 0.0–2.0) | 20.0 (33.1; 0.0–99.0) † |
| Beck Depression Inventory at baseline | 1.0 (1.0) | 4.6 (3.7) |
| Beck Depression Inventory at 3-year follow-up | 1.0 (1.6) | 5.5 (7.5) |
| State Trait Anxiety Inventory at baseline | 24.3 (2.6) | 29.1 (13.2) |
| State Trait Anxiety Inventory at 3-year follow-up * | 21.3 (2.4) | 29.8 (8.1) |
| Vocabulary T-score at baseline | 62.4 (9.0) | 57.5 (8.6) |
| CBCL Externalizing T-score at baseline * | 38.3 (7.7) | 52.1 (9.8) |
| ASR Externalizing T-score at 3-year follow-up * | 41.3 (12.8) | 59.4 (10.7) |
| CBCL Internalizing T-score at baseline * | 41.0 (8.3) | 50.4 (8.1) |
| ASR Internalizing T-score at 3-year follow-up | 38.5 (11.3) | 49.0 (15.5) |
* p < 0.05; † One sub with ninety-nine episodes, otherwise range (0–27).