TABLE II.
Summary statistics by trajectory groups (percentages or means with standard deviations). Classification into trajectory with highest Bayesian posterior probability
| Trajectories of marijuana use | Whole sample (N=838) | ||||
|---|---|---|---|---|---|
|
| |||||
| Non user (n=376) | Quitter (n=145) | Moderate user (n=147) | Increasing chronic (n=170) | ||
| Females | 72.9% (n=274) | 66.2% (n=96) | 45.6% (n=67) | 35.9% (n=61) | 59.4% (n=498) |
| African American | 58.0% (n=218) | 53.1% (n=77) | 47.6% (n=70) | 55.9% (n=95) | 54.9% (n=460) |
| Delinquency at T1 | 1.4 (0.4) | 1.6 (0.6) | 1.6 (0.6) | 1.7 (0.7) | 1.5 (0.6) |
| Alcohol use at T1 | 1.1 (0.3) | 1.3 (0.5) | 1.3 (0.5) | 1.3 (0.4) | 1.2 (0.4) |
| Peer deviance at T4 | 1.4 (0.6) | 1.6 (0.7) | 1.7 (0.7) | 1.9 (0.8) | 1.6 (0.7) |
| Educational level at T4 | 2.8 (1.9) | 2.3 (1.8) | 2.5 (2.0) | 1.8 (1.8) | 2.4 (1.9) |
| Shooting or hitting someone with a weapon (gun or club) at T4 | 3.7% (n=14) Males=2.9% Females=4.0% |
9.7% (n=14) Males=20.4% Females=4.2% |
8.8% (n=13) Males=10.0% Females=7.5% |
18.2% (n=31) Males=22.0% Females=11.5% |
8.6% (n=72) Males=13.2% Females=5.4% |
| Holding a weapon (gun or club) to someone at T4 | 7.4% (n=28) Males=9.8% Females=6.6% |
21.1% (n=31) Males=40.8% Females=11.5% |
17.0% (n=25) Males=21.3% Females=11.9% |
32.9% (n=56) Males=37.6% Females=24.6% |
16.7% (n=140) Males=25.9% Females=10.4% |
| Stealing from someone (some place) without a weapon at T4 | 7.7% (n=29) Males=12.6% Females=5.8% |
4.8% (n=7) Males=8.2% Females=3.1% |
13.6% (n=20) Males=15.0% Females=11.9% |
25.9% (n=44) Males=30.3% Females=18.0% |
11.9% (n=100) Males=18.2% Females=7.6% |
Notes. The answer options for delinquency at T1 ranged from never (1) to 5 or more times (5). The answer options for alcohol use at T1 ranged from never (1) to three or more drinks every day (5). The answer options for peer deviance at T4 ranged from none (1) to most (4). The answer options for educational level at T4 ranged from 11th grade or below (0) to post graduate degree (6)