The results of the main meta-analysis revealed a significant small effect favouring PA interventions over control. However, the high heterogeneity (I2=57.7%) associated with the pooled treatment suggests that the effects reported by individual trials are variable and interpretation of the pooled effect should be made with caution. As the authors included non-randomised trials, it is possible that the effect reported is overestimated. In addition, there was no attempt to assess the risk of bias among included studies and to assess the overall quality of evidence. To read the full article, log in using your NHS OpenAthens details.