Cohort progression — Koszalińskie TKKF
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 50 freestyle50 breaststroke400 freestyle100 breaststroke100 freestyle200 breaststroke100 medley200 freestyle50 backstroke50 butterfly200 medley800 freestyle200 backstroke400 medley1500 freestyle100 backstroke100 butterfly
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 1979 born 1974 born 1972