| Condition |  | Wald χ2 (df = 1)a | |||||
---|---|---|---|---|---|---|---|---|
 | IAU ( n = 64) | PFL ( n = 128) | Time | Time X group | ||||
 | Preintervention | Postintervention | Preintervention | Postintervention | F (df) | p | F (df) | p |
 | Peak number of drinks in a day b | |||||||
0 | 20.3% | 23.4% | 15.5% | 12.4% | 2.29 | .13 | 7.25 | <.007 |
1-3 | 29.7% | 31.3% | 35.7% | 20.2% | (1, 379) | Â | (1, 379) | Â |
≥4 | 50.0% | 45.3% | 48.8% | 67.4% |  |  |  |  |
 | Usual number of drinks b | |||||||
0 | 19.0% | 14.3% | 15.5% | 11.6% | 20.97 | <.001 | 0.96 | .330 |
1-3 | 58.8% | 50.7% | 67.4% | 51.9% | (1, 191) | Â | (1, 191) | Â |
≥4 | 22.2% | 35.0% | 17.1% | 36.5% |  |  |  |  |
Per week marijuana/other drug use | ||||||||
Never | 92.3% | 83.1% | 92.2% | 86.0% | 15.01 | <.001 | 0.77 | .313 |
≤1x | 3.1% | 9.2% | 7.0% | 11.7% | (1, 192) |  | (1, 192) |  |
≥2x | 4.6% | 7.7% | 0.8% | 2.3% |  |  |  |  |