Additional file 3.

A summary of the calculation of effect size using Cohen's d. A detailed explanation of how was calculated the effect size using Cohen's d for every study identified in this review has been included. Conceptual data, numerical data and formulas are provided for every study that provided enough data to calculate effect size; moreover, studies where calculation was not possible were likewise mentioned.

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Chill√≥n et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:10   doi:10.1186/1479-5868-8-10