254 Appendices Outcome categories 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 Other 4 9 0.007 (-0.241–0.256) -0.172 (-0.462–0.118) Type intervention 20 164 F(2,161) = 0.024 0.977 0.000 0.048*** Individual (RC) 14 138 0.068 (-0.063–0.200) Group 3 15 0.091 (-0.212–0.394) 0.023 (-0.308–0.353) Combined 3 11 0.100 (-0.204–0.404) 0.032 (-0.299–0.363) Personal network involvement 20 164 F(1,162) = 0.519 0.472 0.000 0.042*** Yes (RC) 4 52 0.007 (-0.211–0.226) No 16 116 0.099 (-0.022–0.219) 0.091 (-0.159–0.341) Duration 20 164 0.056 (-0.051–0.162) 0.013 (-0.008–0.033) F(1,162) = 1.494 0.223 0.000 0.036*** Study characteristics Type control condition 19 158 F(1,156) = 3.044 0.083 0.000 0.044*** TAU (RC) 17 126 0.065 (-0.048–0.178) TAU+ 3 32 0.213 (0.032–0.394)* 0.148 (-0.020–0.317) Type intervention condition 20 164 F(1,162) = 0.243 0.623 0.000 0.041*** TAU+SNI (RC) 13 85 0.097 (-0.035–0.229) SNI 8 79 0.047 (-0.115–0.208) -0.051 (-0.253 0.152) Risk of bias 20 164 F(2,161) = 0.259 0.772 0.000 0.047*** High (RC) 9 39 0.083 (-0.094–0.261) Some concerns 8 90 0.039 (-0.128–0.207) -0.044 (-0.288–0.200) Low 3 35 0.154 (-0.116–0.423) 0.071 (-0.252–0.393) 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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