Systematic Review: The Effects of Growth Hormone on Athletic Performance

We used a random-effects model and a weighted mean difference effect size to compare GH-treated and non–GH-treated participants. The black diamond represents the summary effect size for the outcome of interest. Values greater than 0 indicate that results with GH treatment were higher than those without GH treatment. The studies are ordered by mean effect size. *Male. †Female. ‡High-dose group. §Low-dose group.