Cohort progression — Skara 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 freestyle50 breaststroke100 freestyle50 backstroke100 breaststroke50 butterfly25 butterfly25 freestyle25 breaststroke25 backstroke100 medley100 backstroke200 freestyle200 medley200 breaststroke100 butterfly