263 Supplementary material | Appendix A A Table 3.6. Results of moderator analyses for categorical and continuous predictor characteristics on substance use. 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 Substance use Outcome characteristics Outcome subcategories 9 103 F(2,100) = 8.111 0.001*** 0.000 0.030*** Substance use (RC) 8 40 0.101 (-0.060–0.263) Days substance use 4 32 0.046 (-0.121–0.212) -0.056 (-0.144–0.032) Abstinence 3 31 0.226 (0.057–0.395)** 0.124 (0.035–0.214)** Assessment time 9 119 F(1,117) = 0.153 0.696 0.000 0.049*** Post (RC) 8 24 0.087 (-0.109–0.283) Follow-up 7 95 0.105 (-0.084–0.295) 0.018 (-0.074–0.110) Sample characteristics Sex 9 120 0.184 (0.113–0.255)*** -0.013 (-0.018–-0.007)*** F(1,118) = 20.151 0.001*** 0.000 0.002 Age 9 120 0.102 (-0.080–0.285) 0.011 (-0.011–0.033) F(1,118) = 0.960 0.329 0.000 0.047*** Intervention characteristics Type caregiver 8 118 F(1,116) = 1.005 0.318 0.000 0.100*** Informal (RC) 3 9 0.328 (-0.146–0.802) Formal 5 105 0.040 (-0.274–0.353) -0.288 (-0.856–0.281) Duration 9 120 0.415 (0.086–0.743)* 0.169 (0.020–0.318)* F(1,118) = 5.049 0.026* 0.000 0.039*** Study characteristics Type intervention condition 9 120 F(1,118) = 0.000 0.991 0.000 0.071*** TAU+SNI (RC) 5 23 0.119 (-0.177–0.415) SNI 5 23 0.116 (-0.193–0.426) -0.003 (-0.431–0.426) Risk of bias 8 80 F(1,78) = 1.270 0.263 0.011 0.101*** High (RC) 4 10 0.330 (-0.105–0.765) Some concerns 4 70 0.015 (-0.334–0.363) -0.315 (-0.873–0.242) 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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