Fig. 8From: Darwinian Selection Discriminates Young Athletes: the Relative Age Effect in Relation to Sporting PerformanceRating points (i.e., higher is better) for Swedish cross-country skiers analyzed by birth tertile (T) and sex in different age groups with Kruskal-Wallis one-way analysis of variance (statistics at the top of the figure), when significant followed by Steel-Dwass post-hoc test for multiple comparison between groups. The boundary of the box closest to zero indicates the 25th percentile, the line within the box marks the median, and the boundary of the box farthest from zero indicates the 75th percentile. End of whiskers represents the lowest and highest data point within 1.5× interquartile range of the first and third quartile. *P ≤ 0.05, **P ≤ 0.01Back to article page