Cohort progression — Kosatky Karviná
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 freestyle100 freestyle100 backstroke100 medley50 backstroke100 breaststroke50 butterfly50 breaststroke200 medley200 breaststroke200 backstroke100 butterfly200 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2009 born 2008 born 2007