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Forest plot showing the effect of physical activity on attention, expressed as mean differences between the values obtained in the intervention and control groups. A positive effect size indicated that physical activity increased attention. Horizontal lines represent 95% CIs. Diamonds indicate the pooled-effect size from the random-effects analysis. The values ±0.2, ±0.5, and ±0.8 are illustrative of small, medium and large effect sizes, respectively [16,19,22].
