Table 2.
Predictor-by-treatment interaction regressed individually using last-observation-carried-forward (LOCF) imputation 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) |
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| betab | P | R2c | Betab | P | R2c | |
| Female | .003 | .98 | .03 | .22 | .045 | .02 |
| High educational level | .17 | .17 | .03 | .33 | .01 | .03 |
| High Internet competence | .13 | .39 | .03 | .11 | .44 | .00 |
| High treatment expectancy | .09 | .37 | .03 | .09 | .37 | .00 |
| Moderate problem drinking (female/male 14-35 or 21-50 units a weeka) | -.02 | .86 | .03 | .04 | .70 | .06 |
| Prior help for drinking | .07 | .48 | .03 | -.05 | .60 | .00 |
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