TABLE 3.
Six- and 12-Month Interaction Effects to Examine the Most Effective Combination of ED and Post-ED Session
| Variable | 6-Month (N = 717) IRR (95% CI) | P | 12-Month (N = 735) IRR (95% CI) | P |
|---|---|---|---|---|
| Alcohol consumption indexa | ||||
| Computer BI | 0.93 (0.74–1.17) | .5422 | 0.97 (0.81–1.17) | .7431 |
| Therapist BI | 0.80 (0.64–1.01) | .0615 | 0.99 (0.82–1.18) | .8713 |
| Post-ED session | 0.86 (0.68–1.09) | .2041 | 0.89 (0.74–1.08) | .2367 |
| Computer BI * post-ED session | 1.16 (0.84–1.62) | .3670 | 1.17 (0.90–1.52) | .2441 |
| Therapist BI * post-ED session | 1.29 (0.93–1.80) | .1327 | 1.04 (0.80–1.35) | .7733 |
| Alcohol consequencesb | ||||
| Computer BI | 0.99 (0.85–1.17) | .9410 | 0.73 (0.61–0.88) | .0011 |
| Therapist BI | 0.90 (0.76–1.06) | .2044 | 0.86 (0.72–1.02) | .0792 |
| Post-ED session | 0.84 (0.71–0.99) | .0409 | 0.88 (0.74–1.05) | .1665 |
| Computer BI × post-ED session | 1.09 (0.86–1.39) | .4871 | 1.38 (1.06–1.79) | .0167 |
| Therapist BI × post-ED session | 1.33 (1.05–1.68) | .0199 | 1.02 (0.79–1.33) | .8594 |
The reference group is the control group. These models controlled for baseline values of the domain (ie, alcohol consumption index or alcohol consequences) and age group and gender.
a
Quantity-frequency index; higher scores indicate greater alcohol consumption.
b
The 18-item Rutgers Alcohol Problem Index assessed alcohol-related consequences.