Table 2. Descriptive characteristics based on marijuana use trajectory group membership.
| Variables | Low (n =169, 8.2%) | Intermittent (n=97, 16.2%) | Moderate Decline (n=72, 12.0%) | High Decline (n=79, 13.2%) | Chronic (n=182, 30.4%) |
|---|---|---|---|---|---|
| Age | |||||
| Baseline | 20.0 (2.4) | 19.6 (2.7) | 19.9 (2.5) | 20.3 (2.1) | 20.3 (2.4) |
| 12-Month | 20.9 (2.3) | 20.5 (2.8) | 20.9 (2.5) | 21.4 (2.1) | 21.2 (2.4) |
| 24-Month | 22.0 (2.4) | 21.3 (2.7) | 22.0 (2.5) | 22.3 (2.2) | 22.2 (2.3) |
| Male | |||||
| Baseline | 46.2% | 61.9% | 66.7% | 63.3% | 63.7% |
| 12-Month | 42.5% | 58.8% | 66.1% | 61.1% | 64.1% |
| 24-Month | 43.5% | 55.7% | 64.1% | 63.5% | 62.6% |
| Assault Injury Group | |||||
| Baseline | 57.4% | 63.9% | 63.9% | 54.4% | 55.5% |
| 12-Month | 57.5% | 66.3% | 69.4% | 51.4% | 54.9% |
| 24-Month | 58.1% | 65.8% | 65.6% | 54.1% | 53.1% |
| Physical Aggression | |||||
| Baseline | 6.3 (8.5) | 9.5 (15.6) | 11.1 (12.1) | 12.4 (14.7) | 11.4 (15.6) |
| 12-Month | 2.8 (7.3) | 2.9 (5.9) | 3.6 (7.4) | 7.2 (15.2) | 7.5 (13.8) |
| 24-Month | 1.7 (5.4) | 4.2 (11.1) | 2.0 (4.9) | 4.3 (12.0) | 3.2 (10.0) |
| Physical Victimization | |||||
| Baseline | 13.0 (17.7) | 14.3 (18.9) | 13.7 (14.1) | 14.2 (16.0) | 13.6 (17.0) |
| 12-Month | 3.3 (7.1) | 3.5 (8.1) | 4.7 (8.1) | 6.9 (12.4) | 8.2 (14.0) |
| 24-Month | 1.7 (5.1) | 5.8 (15.5) | 1.3 (2.8) | 4.1 (10.2) | 3.8 (10.3) |
| Drug Treatment | |||||
| Baseline | 10.7% | 8.3% | 5.6% | 8.9% | 8.2% |
| 12-Month | 5.2% | 8.8% | 11.3% | 8.3% | 5.9% |
| 24-Month | 6.1% | 11.4% | 10.9% | 8.1% | 4.1% |
| Incarceration | |||||
| Baseline | 18.3% | 20.6% | 27.8% | 30.4% | 24.7% |
| 12-Month | 3.7% | 7.5% | 17.7% | 2.8% | 7.2% |
| 24-Month | 9.5% | 8.9% | 17.2% | 23.0% | 7.5% |
| Negative Peer Influences | |||||
| Baseline | 13.5 (4.8) | 13.6 (4.8) | 14.0 (4.0) | 14.6 (4.4) | 15.6 (5.1) |
| 12-Month | 12.1 (3.9) | 12.9 (4.0) | 13.2 (4.7) | 14.1 (4.4) | 15.4 (5.0) |
| 24-Month | 11.6 (3.9) | 14.1 (5.3) | 12.5 (3.6) | 13.2 (4.8) | 14.6 (4.8) |
| Positive Peer Influences | |||||
| Baseline | 9.0 (3.3) | 8.9 (3.0) | 9.0 (2.7) | 8.9 (3.0) | 8.3 (2.7) |
| 12-Month | 8.9 (3.2) | 8.5 (2.9) | 8.5 (2.4) | 8.5 (2.6) | 8.1 (2.9) |
| 24-Month | 8.6 (2.8) | 8.3 (3.2) | 8.8 (2.6) | 7.8 (2.9) | 7.7 (2.8) |
| Community Violence | |||||
| Baseline | 5.7 (3.4) | 6.4 (3.8) | 6.5 (3.7) | 7.6 (3.5) | 7.3 (3.5) |
| 12-Month | 4.8 (3.9) | 5.6 (3.7) | 5.5 (3.7) | 6.8 (4.1) | 6.8 (3.6) |
| 24-Month | 4.0 (3.6) | 6.0 (4.2) | 4.7 (3.4) | 5.1(4.0) | 6.0 (3.7) |
Note: Values are Mean (SD) or %.