Cohort progression — Dolnośląski Okręgowy Związek Pływacki
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 backstroke100 backstroke50 butterfly100 medley200 freestyle200 medley200 butterfly400 freestyle800 freestyle200 backstroke50 breaststroke200 breaststroke100 butterfly100 freestyle100 breaststroke400 medley