Fig. 1From: Darwinian Selection Discriminates Young Athletes: the Relative Age Effect in Relation to Sporting PerformanceThe relative age effect expressed as the ratio between observed and expected distributions (national birth statistics) of athletes per tertile (T). XC-Ski 1 refers to dataset cross-country skiing1 and XC-Ski 2 refers to dataset cross-country skiing2. For additional data, see Supplementary file 2Back to article page