Fig. 3

Retention rates from randomization through to primary outcome measurement. Legend: Retention rates and 95% confidence intervals for studies reporting participant retention to primary outcome, as a proportion. Black squares represent point estimates, with accompanying black horizontal lines representing 95% confidence intervals. The diamond and vertical dashed line represent the pooled retention rate. The width of the diamond represents the pooled confidence interval. Heterogeneity Statistics: Tau² = 0.06; chi-square = 116.60, df = 18 (p = 0.00). Test for overall effect: Z = 34.24 (p = 0.00). Abbreviations: ES = effect size