Table 2 Percentage of heavy drinking and frequency of binge drinking at one and six months follow-up by condition (WDYD intervention versus control): intention-to-treat analyses (multiple imputation) (N = 609) and completers-only analyses (n = 280) adjusted for clustering and covariates (i.e., gender and education level)

Heavy drinking

1-month follow-up

Intention-to-treat

318

25.3

291

26.3

0.96

[0.84 to 1.10]

0.54

83

Completers-only

130

34.6

150

37.3

0.91

[0.79 to 1.04]

0.18

37

6-month follow-up

Intention-to-treat

318

29.5

291

31.5

0.97

[0.84 to 1.11]

0.65

49

Completers-only

130

30.8

150

34.7

0.91

[0.77 to 1.08]

0.28

26

Frequency of binge drinking

1-month follow-up

Intention-to-treat

318

43.3

291

47.7

0.92

[0.82 to 1.04]

0.18

23

Completers-only

130

57.7

150

66.7

0.85

[0.73 to 0.98]

0.03

11

6-month follow-up

Intention-to-treat

318

55.3

291

57.5

0.95

[0.85 to 1.06]

0.35

49

Completers-only

130

50.8

150

55.3

0.91

[0.80 to 1.03]

0.13

24