260 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 Personal network involvement 20 80 F(1,78) = 1.039 0.311 0.030*** 0.026*** Yes (RC) 5 32 -0.043 (-0.219–0.133) No 15 48 0.068 (-0.059–0.194) 0.111 (-0.106–0.328) Duration 20 80 0.028 (-0.083–0.140) 0.001 (-0.022–0.025) F(1,78) = 0.009 0.925 0.030*** 0.027** Study characteristics Type control condition 20 80 F(2,77) = 2.552 0.085 0.029*** 0.020** TAU (RC) 15 63 -0.000 (-0.106–0.106) TAU+ 3 9 -0.029 (-0.277–0.218) -0.029 (-0.292–0.234) Passive 3 8 0.389 (0.055–0.723) 0.389 (0.039–0.740)* Type intervention condition 20 80 F(1,78) = 1.086 0.301 0.030*** 0.022** TAU+SNI (RC) 15 64 0.002 (-0.108–0.113) SNI 6 16 0.118 (-0.079–0.314) 0.115 (-0.105–0.335) Risk of bias 20 80 F(2,77) = 1.733 0.184 0.030*** 0.021** High (RC) 8 17 0.150 (-0.031–0.332) Some concerns 9 53 -0.052 (-0.183–0.079) -0.202 (-0.426–0.022) Low 3 10 0.080 (-0.153–0.312) -0.070 (-0.365–0.225) 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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