Figure 1.

Flow diagram of the screening process. From the 89 studies selected, 71 were from original studies and 18 were from secondary data analyses of the 71 papers that were included. From the 71 studies, 61 groups were used in the final analysis. For these 61 groups, results were presented for each sex (n = 26 male; n = 35 female), and body composition was measured with either dual-X-ray absorptiometry (DEXA), hydrostatic weighing or bod pod. Only articles with a mean age or with a small range of age (i.e., [19,20,21,22,23]) were kept for further investigation. One group was discarded because the frequency was not mentioned in the article.