Fig. 4.

Forest plot for meta-analysis II illustrating the effect of mindfulness- and acceptance-based interventions on sport performance outcomes in athletes in comparison to controls. Effect sizes are the standardized mean difference (SMD [Hedges’ g]) with a 95% confidence interval (CI). Black squares are individual effect sizes and the square size represents the relative weight. Black rhombuses are the summary effect size estimate for the random-effect (RE) model with model-based variance estimates and with robust variance estimates (RVE). a and b are separate performance outcomes in the same study