We will incorporate newly identified studies into the analyses previously reported in the Cochrane systematic review by Everett et al. [107]. Additional studies extracted from the review by Arbyn et al. [106] will be pooled via the same methods. In some cases, we may also deem it appropriate to combine intervention groups from multi-arm trials using standard methods to avoid unit of analysis issues [119]. We will transform the pooled RR for each outcome to the absolute values via standard methods [123]. We will calculate the number needed to treat for an additional beneficial outcome (i.e. participation) for outcomes with statistically significant results. We will report on studies that are not appropriate for statistical pooling narratively.

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