Table 4.
Predictors of Days of Marijuana Use at Each Time Point
| Main Effect Models | Interaction Models | |||||
|---|---|---|---|---|---|---|
| B (SE) | Beta | T(p) | B (SE) | Beta | T(p) | |
| Time 1 | R2 = .19 | R2 = .22 | ||||
|
| ||||||
| Past-year marijuana | 1.84 (0.42) | 0.89 | 4.36**** | 1.79 (0.56) | 0.17 | 3.20*** |
| PIRI v PPRS | −0.03 (0.35) | −0.02 | −0.10 | −4.22 (0.97) | −1.26 | −4.74**** |
| TAU v PPRS | 0.38 (0.36) | 0.17 | 1.07 | 0.63 (0.84) | 0.05 | 0.75 |
| Minority status | 0.71 (0.31) | 0.34 | 2.32* | 0.72 (0.52) | 0.07 | 1.38 |
| Prior SA | 0.44 (0.32 | 0.21 | 1.37 | −0.09 (0.55) | −0.01 | −0.16 |
| PIRI v PPRS × marijuana | – | – | – | 7.14 (0.67) | 0.84 | 7.62**** |
| TAU v PPRS × marijuana | – | – | – | −0.56 (0.80) | −0.04 | −0.71 |
| PIRI v PPRS × minority | – | – | – | −0.41 (0.70) | −0.03 | 0.59 |
| TAU v PPRS × minority | – | – | – | 0.17 (0.72) | 0.01 | 0.23 |
| PIRI v PPRS × prior SA | – | – | – | 3.21 (0.86) | 0.24 | 3.74**** |
| TAU v PPRS × prior SA | – | – | – | −0.08 (0.68) | −0.01 | −0.12 |
|
| ||||||
| Time 2 | R2 = .19 | R2 = .22 | ||||
|
| ||||||
| Past-year marijuana | 1.70 (0.42) | 0.90 | 4.08**** | 1.31 (0.57) | 0.44 | 2.32* |
| PIRI v PPRS | −0.46 (0.35) | −0.23 | −1.32 | −3.30 (1.21) | −1.04 | −2.73** |
| TAU v PPRS | −0.55 (0.37) | −0.28 | −1.49 | −0.62 (1.04) | −0.20 | −0.60 |
| Minority status | 0.59 (0.32) | 0.31 | 1.82 | 0.78 (0.59) | 0.26 | 1.33 |
| Prior SA | 0.39 (0.35) | 0.20 | 1.13 | 0.27 (0.59) | 0.09 | 0.46 |
| PIRI v PPRS × marijuana | – | – | – | 1.01 (0.78) | 0.26 | 1.31 |
| TAU v PPRS × marijuana | – | – | – | 0.61 (0.86) | 0.14 | 0.71 |
| PIRI v PPRS × minority | – | – | – | −0.64 (0.78) | −0.17 | −0.83 |
| TAU v PPRS × minority | – | – | – | −0.08 (0.74) | −0.02 | −0.10 |
| PIRI v PPRS × prior SA | – | – | – | 2.69 (0.94) | 0.73 | 2.86** |
| TAU v PPRS × prior SA | – | – | – | −0.81 (0.81) | −0.22 | −0.10 |
|
| ||||||
| Time 3 | R2 = .22 | R2 = .29 | ||||
|
| ||||||
| Past-year marijuana | 3.39 (0.60) | 0.96 | 5.60**** | 4.11 (1.04) | 0.40 | 3.94**** |
| PIRI v PPRS | 0.72 (0.45) | 0.20 | −1.60 | 0.36 (1.60) | 0.03 | 0.22 |
| TAU v PPRS | 0.58 (0.51) | 0.16 | 1.15 | −8.92 (1.41) | −0.82 | −6.31**** |
| Minority status | 0.30 (0.36) | 0.08 | 0.83 | 0.92 (0.70) | 0.09 | 1.33 |
| Prior SA | 0.28 (0.38) | 0.08 | 0.73 | −0.87 (0.67) | −0.08 | −1.29 |
| PIRI v PPRS × marijuana | – | – | – | −1.91 (1.23) | −0.15 | −1.55 |
| TAU v PPRS × marijuana | – | – | – | 9.74 (1.12) | 0.67 | 8.68**** |
| PIRI v PPRS × minority | – | – | – | −0.77 (0.85) | −0.06 | −0.90 |
| TAU v PPRS × minority | – | – | – | −0.88 (0.93) | −0.06 | −0.94 |
| PIRI v PPRS × prior SA | – | – | – | −3.43 (0.92) | 0.27 | −3.75**** |
| TAU v PPRS × prior SA | – | – | – | 0.23 (0.92) | 0.02 | 0.25 |
Note: The Prevention of Post-Rape Stress (PPRS) is the comparison condition (coded 0) in dummy variables in all analyses.
*
p<0.05,
**
p<0.01,
***
p<0.001,
****
p<.0004