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Methods: We systematically searched seven databases from January 2015 to May 2020 for randomised controlled trials of teacher-led school-based activity behaviour interventions that included any form of staff training. Pilot, feasibility and small-scale (≤ 100 students) trials were excluded. We searched for information about training from any study output identified (eg protocols, process evaluations, outcome evaluations, trial registries, study websites). We used the Template for Intervention Description and Replication (TiDieR) checklist, a reporting guideline of the minimum set of items considered essential for intervention description and replication, to determine complete reporting.

Results: We identified 183 study outputs reporting on 53 training programmes delivered within 51 randomised controlled trials (median student sample size: 779; interquartile range: 361-1397). Complete information, in which all TiDieR …