Cohort progression — Opolski Okregowy 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.

Sex: WomenMen Pool: 25 m pool50 m pool

Event: 100 medley 400 freestyle 100 butterfly 200 medley 200 freestyle 100 backstroke 100 breaststroke 100 freestyle 50 breaststroke 200 breaststroke 50 butterfly 400 medley 50 freestyle 50 backstroke 200 backstroke 800 freestyle

Cohorts to compare: 2007 3 2004 7 2003 7 2000 5 1999 5 1998 4 1997 8

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