258 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 Type intervention 17 66 F(1,64) = 0.894 0.348 0.000 0.120*** Individual (RC) 12 51 0.206 (-0.017–0.428) Combined 5 15 0.402 (0.052–0.752)* 0.196 (-0.218–0.611) Personal network involvement 18 70 F(1,68) = 4.574 0.036* 0.000 0.141*** Yes (RC) 3 18 -0.106 (-0.555–0.343) No 15 52 0.428 (0.212– 0.644)*** 0.534 (0.036–1.033)* Duration 18 70 0.361 (0.130–0.592)** -0.013 (-0.049–0.022) F(1,68) = 0.574 0.451 0.000 0.182*** Study characteristics Type intervention condition 18 70 F(1,68) = 0.053 0.818 0.000 0.181*** TAU+SNI (RC) 13 51 0.320 (0.077–0.562)* SNI 6 19 0.361 (0.028–0.695)* 0.042 (-0.319–0.403) Risk of bias 16 63 F(1,61) = 0.001 0.973 0.000 0.215*** High (RC) 8 17 0.350 (-0.022–0.721) Some concerns 8 46 0.341 (0.002–0.681)* -0.008 (-0.511–0.495) 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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