Fig. 10

Rating (i.e., higher is better) for Swedish chess players analyzed by birth tertile (T) in different age groups with Kruskal-Wallis one-way analysis of variance (statistics at the top of the figure). For this figure, both sexes are pooled (similar rating points between sexes). 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