Cohort progression — Międzynarodowa SP Edukacji Innowacyjnej
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 25 freestyle25 backstroke25 breaststroke50 freestyle50 breaststroke50 backstroke50 butterfly25 unknown
25 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2016 born 2015