Table 1.
Baseline characteristics of the study population (N=7932).
| Characteristic | Intervention (n=3970) |
Control (n=3962) |
| Age (years), mean (SD) | 37.97 (10.96) | 38.29 (10.78) |
| Gender (female), n (%) | 2246 (57) | 2299 (58) |
| Have university degree, n (%) | 2067 (52) | 2026 (51) |
| White British, n (%) | 3317 (84) | 3316 (84) |
| Have children, n (%) | 2052 (52) | 2027 (51) |
| Provided offline address or telephone number, n (%) | 1559 (39) | 1528 (39) |
| Past-week alcohol consumption in unitsa, mean (SD) | 57.68 (39.62) | 56.86 (38.09) |
| EQ-5D, mean (SD) | 0.84 (0.19) | 0.84 (0.19) |
| Confidenceb, mean (SD) | 2.77 (1.16) | 2.79 (1.15) |
| Intentionb, mean (SD) | 3.82 (1.09) | 3.85 (1.06) |
a 1 unit = 8 g ethanol.
b Confidence and intention scored on a 5-point scale with 1 as the lowest and 5 as the highest.