Cohort progression — UKS Zespołu Szkół Mistrzostwa Sportowego
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 100 freestyle50 freestyle50 backstroke100 backstroke100 breaststroke200 medley50 butterfly50 breaststroke100 medley200 backstroke400 freestyle100 butterfly200 breaststroke25 freestyle