Table A2.
Actual intervention received analysis (N = 121)
| Repeated measures model effects | Total AUDIT | Drinks per drinking day | Drinking days in 14 days | Heavy episodic drinking |
|---|---|---|---|---|
| Intervention Received main effect | F = 1.09 (p = .2980) | F = 0.01 (p = .9542) | F = 0.01 (p = .9168) | F = 4.15 (p = .0439) |
| Time main effect | F = 10.66 (p = .0001) | F = 8.89 (p = .0003) | F = 8.03 (p = .0005) | F = 15.37 (p < .0001) |
| Intervention Received x Time interaction | F = 0.06 (p = .9441) | F = 0.85 (p = .4286) | F = 1.20 (p = .3040) | F = 0.55 (p = .5810) |
| Model-based Least Squares Means | Baseline | 2 Weeks FU | 8 Weeks FU | Average Row |
| Total AUDIT | ||||
| Intervention | 20.51 | 18.15 | 17.05 | 18.57 |
| Control | 18.67 | 15.98 | 15.26 | 16.64 |
| Average column | 19.59 | 17.06 | 16.16 | |
| Drinks per drinking day | ||||
| Intervention | 3.42 | 2.52 | 2.62 | 2.85 |
| Control | 3.55 | 2.65 | 2.22 | 2.81 |
| Average column | 3.48 | 2.58 | 2.42 | |
| Drinking days in 14 days | ||||
| Intervention | 6.37 | 5.06 | 4.84 | 5.42 |
| Control | 5.83 | 4.77 | 5.39 | 5.33 |
| Average column | 6.10 | 4.91 | 5.12 | |
| Heavy episodic drinking | ||||
| Intervention | 2.55 | 2.34 | 2.03 | 2.32 |
| Control | 2.25 | 1.88 | 1.57 | 1.90 |
| Average column | 2.40 | 2.14 | 1.80 | |
| Pairwise contrasts for time effect | Total AUDIT | Drinks per Drinking Day | Drinking Days in 14 days | Heavy Episodic Drinking |
| Baseline vs. 2 Weeks FU | t = 3.49 (p = .0007) | t = 3.79 (p = .0002) | t = 3.94 (p = .0001) | t = 2.70 (p = .0079) |
| Baseline vs. 8 Weeks FU | t = 4.59 (p < .0001) | t = 3.90 (p = .0002) | t = 2.70 (p = .0080) | t = 5.53 (p < .0001) |
| 2 Weeks FU vs. 8 Weeks FU | t = 1.53 (p = .1276) | t = 0.80 (p = .4279) | t = -0.62 (p = .5361) | t = 3.39 (p = .0010) |
Degrees of freedom for F-tests are df = 1,119 for the intervention-received main effect, and df = 2,119 for both the time main and intervention-received x time interaction effects. Degrees of freedom for all pairwise contrast t-tests are df = 119. N = 85 for the intervention-received group and N = 36 for the control-received group.