Appendix A. Numbered list of 62 articles used in a previous review (Poveda et al. 2008), including 45 articles used in the present meta-analysis.

Numbered list of 62 articles used in a previous review (Poveda et al. 2008), including 45 articles used in the present meta-analysis

Appendix D. An article-by-article comparison of individual outcome counts from statistical tests (Poveda et al. 2008) with mean or individual Hedge's d effect sizes calculated in the present study using only the 45 articles reviewed in common.

An article-by-article comparison of individual outcome counts from statistical tests (Poveda et al. 2008) with mean or individual Hedge's d effect sizes calculated in the present study using only the 45 articles reviewed in common

Appendix C. Normal plot of Hedge's d values.

Normal plot of Hedge's d values

Appendix B. Salquero-Rivera method for calculating a grand standard deviation for a series of measurements each of which has an associated standard error or standard deviation.

Salquero-Rivera method for calculating a grand standard deviation for a series of measurements each of which has an associated standard error or standard deviation