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Table 4 Intervention effects on adolescent alcohol use of combined time points for studies reporting categorical measures

From: Effectiveness of school-based preventive interventions on adolescent alcohol use: a meta-analysis of randomized controlled trials

  Studies reporting categorical measures
  k N OR ¯ 95% CI Q df I 2
Weekly drinking 6 10140 0.86*** 0.78-0.95 3.71 5 0.00%
Monthly drinking 6 11544 0.92 0.75-1.12 22.05*** 5 77.33%
Lifetime drinking 7 11725 1.04 0.93-1.17 11.02 6 45.53%
  1. Note. Random effect model. k = number of studies; N = total number of participants; OR ¯ = mean Odds Ratio; 95% CI = 95% confidence interval; Q = test of heterogeneity; df = degrees of freedom; I2 = proportion of observed dispersion. *p < .05 **p < .01 ***p < .001.