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Table 3 Weekly alcohol consumption [standard deviations (SD)] 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)

From: The effectiveness of a web-based brief alcohol intervention in reducing heavy drinking among adolescents aged 15–20 years with a low educational background: a two-arm parallel group cluster randomized controlled trial

   Intervention Control      
   M SD M SD dif Beta SE P Cohen’s d
1-month follow-up
  Intention-to-treat 13.2 16.1 12.3 15.0 0.9 −0.01 0.05 0.86 0.06
  Completers-only 13.0 16.2 10.8 12.2 2.2 −0.01 0.06 0.93 −0.02
6-month follow-up
  Intention-to-treat 12.2 15.1 11.7 14.0 0.5 −0.01 0.05 0.89 0.00
  Completers-only 11.5 14.4 10.8 12.3 0.7 −0.01 0.06 0.83 0.08
  1. Note. N number of participants, M mean, SD standard deviation, Dif difference in means between conditions, SE standard error. P p-value.