Cohort progression — Wisby 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 freestyle100 freestyle50 breaststroke50 butterfly50 backstroke100 breaststroke100 medley200 freestyle100 backstroke200 medley400 freestyle200 breaststroke100 butterfly25 freestyle200 backstroke25 breaststroke25 backstroke800 freestyle25 butterfly400 medley