256 Appendices Outcome category Moderator variables Studies (s) Effect sizes (k) Β0 mean d (95% CI) Β1 (95% CI) Omnibus test p value Variance level 2 Variance level 3 Study characteristics Type intervention condition 14 32 F(1,30) = 0.220 0.643 0.082*** 0.000 TAU+SNI (RC) 11 28 0.137 (0.003–0.271)* SNI 3 4 0.045 (-0.332–0.422) -0.092 (-0.492–0.309) Risk of bias 12 28 F(2,26) = 0.049 0.827 0.099*** 0.000 High (RC) 7 15 0.131 (-0.072–0.334) Some concerns 5 13 0.099 (-0.113–0.312) -0.032 (-0.326–0.262) Note: s = number of independent studies. k = number of effect sizes. Β0 mean d = Cohen’s d mean effect size of the corresponding predictor. Β1 = mean effect size difference between reference category and other corresponding categories. CI = confidence interval. Variance level 2 = variance between effect sizes within studies. Variance level 3 = variance between studies. RC = reference category. TAU+SNI = treatment as usual with the addition of a social network intervention. SNI = social network intervention only intervention condition. TAU+ = comparison group consisting of treatment as usual with the addition of another intervention. TAU = treatment as usual only control condition. *p < 0.05. **p < 0.01. ***p < 0.001.
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