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Table 5 Intervention effects for studies reporting continuous measures for frequency and quantity of alcohol use

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

  Frequency of Alcohol Use Quantity of Alcohol Use
  k N g ¯ 95% CI Q df I 2 k N g ¯ 95% CI Q df I 2
Weekly drinking 0 - - - - - - 3 3570 0.13* 0.01-0.25 3.98 2 49.70%
Monthly drinking 2 2119 0.07 −0.05-0.20 1.76 1 43.18% 2 4838 0.13 −0.09-0.35 1.81 1 44.69%
Lifetime drinking 2 3536 0.10 −0.06-0.27 4.25 1 76.45% 3 2216 0.50 −0.18-1.17 88.75*** 2 97.75%
  1. Note. Random effect model. k = number of studies; N = total number of participants; g ¯ = mean Hedges’g; 95% CI = 95% confidence interval; Q = test of heterogeneity; df = degrees of freedom; I2 = proportion of observed dispersion. *p < .05 **p < .01 ***p < .001.