Table 3. Multinomial regression findings for baseline, 12-month, and 24-month variables associated with marijuana use trajectory group membership.
| Variables | Intermittent RRR (CI) | Moderate Decline RRR (CI) | High Decline RRR (CI) | Chronic RRR (CI) |
|---|---|---|---|---|
| Baseline | ||||
| Age | 0.94 (0.84-1.05) | 0.99 (0.88-1.12) | 1.04 (0.93-1.17) | 1.04 (0.95-1.14) |
| Male | 2.16 (1.24-3.76)** | 2.72 (1.45-5.12)** | 2.15 (1.17-3.98)* | 2.26 (1.40-3.65)** |
| Assault Injury Group | 1.13 (0.66-1.92) | 1.07 (0.59-1.93) | 0.69 (0.39-1.21) | 0.78 (0.49-1.22) |
| Physical Aggression | 1.04 (1.01-1.06)* | 1.05 (1.02-1.08)** | 1.04 (1.02-1.08)** | 1.04 (1.01-1.06)** |
| Drug Treatment | 0.70 (0.28-1.74) | 0.38 (0.12-1.21) | 0.57 (0.21-1.53) | 0.50 (0.23-1.10) |
| Incarceration | 0.96 (0.49-1.91) | 1.36 (0.67-2.78) | 1.48 (0.74-2.96) | 0.99 (0.55-1.77) |
| Negative Peer Influences | 0.97 (0.91-1.04) | 0.98 (0.91-1.05) | 0.98 (0.91-1.05) | 1.05 (0.99-1.05) |
| Positive Peer Influences | 0.99 (0.91-1.07) | 1.00 (0.91-1.10) | 1.01 (0.92-1.10) | 0.92 (0.85-0.99)* |
| Community Violence | 1.03 (0.95-1.12) | 1.02 (0.93-1.12) | 1.12 (1.03-1.22)* | 1.07 (1.00-1.15) |
| 12-Months | ||||
| Age | 0.93 (0.83- 1.05) | 1.01 (0.89-1.15) | 1.11 (0.97-1.26) | 1.06 (0.95-1.17) |
| Male | 1.76 (0.98-3.16) | 2.17 (1.12-4.20)* | 2.28 (1.23-4.23)* | 2.46 (1.46-4.12)** |
| Assault Injury Group | 1.30 (0.72-2.34) | 1.47 (0.76-2.85) | 0.63 (0.35-1.16) | 0.68 (0.41-1.13) |
| Physical Aggression | 0.99 (0.95-1.04) | 1.01 (0.97-1.05) | 1.04 (1.01-1.08)* | 1.04 (1.01-1.07)* |
| Drug Treatment | 1.39 (0.45-4.32) | 1.45 (0.45-4.70) | 1.39 (0.42-4.63) | 0.83 (0.28-2.48) |
| Incarceration | 1.41 (0.39-5.10) | 3.38 (1.04-11.0)* | 0.38 (0.07-2.15) | 0.84 (0.26-2.77) |
| Negative Peer Influences | 1.03 (0.95-1.11) | 1.03 (0.95-1.12) | 1.07 (0.99-1.16) | 1.14 (1.06-1.22)** |
| Positive Peer Influences | 0.94 (0.86-1.04) | 0.96 (0.86-1.06) | 0.92 (0.83-1.02) | 0.88 (0.80-0.96)** |
| Community Violence | 1.05 (0.97-1.14) | 1.04 (0.94-1.14) | 1.10 (1.01-1.20)* | 1.08 (1.00-1.16)* |
| 24-Months | ||||
| Age | 0.88 (0.79- 1.00)* | 1.00 (0.88-1.13) | 1.04 (0.92-1.17) | 1.03 (0.93-1.14) |
| Male | 1.69 (0.94-3.01) | 2.20 (1.16-4.17)* | 2.07 (1.11-3.86)* | 2.34 (1.40-3.92)** |
| Assault Injury Group | 1.30 (0.72-2.36) | 1.27 (0.68-2.38) | 0.68 (0.38-1.23) | 0.80 (0.48-1.32) |
| Physical Aggression | 1.02 (0.98-1.06) | 1.00 (0.96-1.05) | 1.03 (0.99-1.07) | 1.01 (0.98-1.05) |
| Drug Treatment | 1.64 (0.58-4.68) | 1.50 (0.51-4.41) | 0.81 (0.25-2.57) | 0.51 (0.16-1.59) |
| Incarceration | 0.40 (0.14-1.14) | 1.17 (0.46-2.97) | 1.79 (0.75-4.28) | 0.32 (0.13-0.84)* |
| Negative Peer Influences | 1.10 (1.02-1.19)* | 1.02 (0.94-1.11) | 1.06 (0.98-1.15) | 1.15 (1.08-1.23)*** |
| Positive Peer Influences | 0.92 (0.83-1.02) | 1.01 (0.91-1.11) | 0.89 (0.81-0.99)* | 0.85 (0.77-0.93)** |
| Community Violence | 1.11 (1.02-1.21)* | 1.04 (0.96-1.14) | 1.05 (0.96-1.14) | 1.11 (1.03-1.19)** |
Note: Low is the reference group. RRR=Relative Risk Ratios
*
p<.05,
**
p<.01,
***
p<.001.