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Table 6 Moderator analysis for school level and program intensity for studies reporting continuous and categorical measures

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

  Studies reporting continuous measures Studies reporting categorical measures
k g ¯ 95% CI Q df I 2 Total between Q k OR ¯ 95% CI Q df I 2 Total between Q
School level:        0.80        0.00
  Junior high school 7 0.12*** 0.05-0.19 14.41* 6 58.42%   8 0.91 0.77-1.07 25.24*** 7 72.26%  
  High school 4 0.35 − 0.15-0.85 143.91*** 3 92.92%   4 0.91 0.80-1.03 2.93 3 0.00%  
Program intensity:        0.07        0.09
  Medium (6 to 10 hours) 7 0.23 − 0.00-0.46 180.11*** 6 96.67%   3 0.90 0.76-1.07 0.47 2 0.00%  
  High (11 to >15 hours) 3 0.20*** 0.13-0.26 1.34 2 0.00%   12 0.93 0.82-1.06 36.16*** 11 69.58%  
  1. Note. Mixed effect analysis. k = number of studies; g ¯ = mean Hedges’g; 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.