Table 3.
Study 1: unadjusted and adjusted multi‐level regression model with serving size predicting observed alcohol consumption (UK units); participants are clustered in pairs (level 2).
| Unadjusted (n = 114) | Adjusted (n = 114) | |||||
|---|---|---|---|---|---|---|
| B (SE) | (95% CI) | P | B (SE) | (95% CI) | P | |
| Fixed components | ||||||
| Intercept | 3.87 (0.32) | (3.23, 4.52) | < 0.001 | 3.99 (0.48) | (3.04, 4.95) | < 0.001 |
| Serving size condition (reference: standard) | −0.80 (0.44) | (−1.69, 0.09) | 0.08 | −1.33 (0.57) | (−2.46, −0.20) | 0.02 |
| Gender (reference: sale) | −1.31 (0.37) | (−2.04, −0.58) | 0.001 | |||
| Serving size × gender | 0.82 (0.55) | (−0.28, 1.92) | 0.14 | |||
| AUDIT | 0.07 (0.02) | (0.02, 0.11) | 0.003 | |||
| TRI Restrict | −0.02 (0.02) | (−0.06, 0.03) | 0.47 | |||
| Random components | ||||||
| Level 2 variance (pairs) | 2.48 (0.53) | 1.84 (0.41) | ||||
| Level 1 variance (participants) | 0.63 (0.12) | 0.57 (0.11) | ||||
AUDIT = Alcohol Use Disorders Identification Test. AUDIT scores range between 0 and 40. TRI = Temptation and Restraint Inventory. TRI Restrict scores range between 3 and 21. CI = confidence interval; SE = standard error.