Table 1.
Baseline characteristics of the 261 participants (values are numbers and percentages of participants, unless otherwise indicated)
| Conditiona | ||
| Experimental n = 130 |
Control n = 131 |
|
| Female genderb | 64 (49.2) | 64 (48.9) |
| Educationb | ||
| Low | 41 (31.5) | 38 (29.0) |
| High (academic/professional)b | 89 (68.5) | 93 (71.0) |
| High Internet competenceb | 104 (80.0) | 100 (76.3) |
| High treatment expectancyb | 61 (46.9) | 66 (49.6) |
| Weekly alcohol intake in standard unitsc (mean, SD) |
43.7 (21.0) | 43.5 (22.3) |
| Moderate problem drinkingb 14-35 units per week (women) 21-50 units per week (men) |
74 (56.9) | 74 (56.5) |
| Severe problem drinking > 35 (women) and > 50 (men) unitsc per week |
56 (43.1) | 57 (43.5) |
| Prior professional help for problem drinkingb | 18 (13.8) | 15 (11.5) |
| Contemplation staged | 116 (89.2) | 115 (87.8) |
| Alcohol moderation as goal | 120 (92.3) | 123 (93.9) |
| Age (mean, SD) | 45.9 (8.9) | 46.2 (9.2) |
| Living with a partner | 75 (57.7) | 71 (54.2) |
| Paid employment | 94 (72.3) | 96 (73.3) |
aAll differences between conditions were non-significant (tested at P < .10).
bIndicates putative predictor of favorable treatment response.
cA standard unit contains 10 g of ethanol.
dAssessed with validated Dutch version of Readiness to Change Questionnaire [39].