Table 3.
Predictor-by-treatment interaction regressed individually using regression imputation (RI) at 6- and 12-month follow-up
| Interaction term: participant characteristic by condition (Drinking Less = 1) | Effect on mean weekly alcohol consumptiona at 6 months (N = 261) | Effect on mean weekly alcohol consumptiona at 12 months (N = 261) | ||||
| betab | P | R2c | betab | P | R2c | |
| Female | .06 | .53 | .12 | .27 | .01 | .03 |
| High educational level | .11 | .37 | .10 | .21 | .10 | .03 |
| High Internet competence | .002 | .99 | .10 | .06 | .97 | .01 |
| High treatment expectancy | .15 | .14 | .11 | .04 | .74 | .00 |
| Moderate problem drinking (female/male 14-35 or 21-50 units a weeka | -.08 | .46 | .16 | -.09 | .39 | .17 |
| Prior help for drinking | .18 | .05 | .11 | .02 | .79 | .01 |
ameasured in standard units containing 10 g of ethanol
bbeta: standardized regression coefficient
c R2: amount of variance in treatment response explained by the model