55 Review of social network intervention studies 2 Figure 2. Three-Level forest plots of mean effect sizes on outcome categories. Note: Three-level forest plots provide an overview of the variability in mean effect sizes per study. Black CI = weight and precision of each study that depends on the total study sampling variance. Grey CI = sampling variance of the individual effect sizes within the study. k = number of effect sizes. Pooled Effect Size = Cohen’s d pooled effect size.
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