Cohort progression — Upplands-Bro Simsällskap
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 freestyle25 freestyle25 backstroke50 breaststroke50 backstroke25 breaststroke100 freestyle100 medley50 butterfly100 breaststroke25 butterfly100 backstroke75 medley