Table 3.
Alcohol consumption on simultaneous use days compared with alcohol-only days
| Variable | Number of drinks | Likelihood of heavy episodic drinking (HED) | ||||
|---|---|---|---|---|---|---|
| B | SE | t | p | OR | [95% CI] | |
| Level 1 | ||||||
| Intercept | 3.32 | 0.30 | 11.08 | <.001 | 0.69 | [0.39, 1.20] |
| Simultaneous use (vs. alcohol only) | 0.84 | 0.25 | 3.40 | .001 | 2.04 | [1.25, 3.32] * |
| Weekend (vs. weekday) | -0.16 | 0.24 | -0.67 | .503 | 1.12 | [0.77, 1.63] |
| Study day (1–30) | 0.02 | 0.01 | 1.14 | .256 | 0.99 | [0.97, 1.01] |
| Level 2 | ||||||
| Age | -0.30 | 0.08 | -3.63 | <.001 | 0.79 | [0.69, 0.90]** |
| Male (vs. female) | 1.26 | 0.41 | 3.01 | .004 | 1.03 | [0.57, 1.87] |
| Mean simultaneous use days | -0.22 | 0.60 | -0.40 | .864 | 0.92 | [0.34, 2.55] |
Notes: OR = odds ratio; CI = confidence interval. Bold indicates the effects of interest when significant. Random slopes for study day, weekend, and day type for model predicting number of drinks. Day type is coded 1 = simultaneous use, 0 = alcohol-only use; sex is coded 0 = female, 1 = male; weekend is coded 0 = Sunday–Thursday, 1 = Friday or Saturday.
*
p < .01;
**
p < .001.