Meta-regression: Association of Variables and Outcomes.

Results of mixed-effects models with at least 4 studies. Outcomes are bold. Coefficients indicate positive or negative association, *(p2 is the estimate of residual heterogeneity compared to the simple random-effects model, § indicates no significant residual heterogeneity in the mixed effect model with p>0.05. A higher reduction of tau2 within the mixed-effect models indicate a higher association with outcome. CI = Confidence interval.Meta-regression: Association of Variables and Outcomes.