Cohort progression — Åbo Simklubb
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 backstroke50 freestyle100 breaststroke50 butterfly400 freestyle100 backstroke100 butterfly100 medley200 breaststroke200 medley200 backstroke200 freestyle50 breaststroke200 butterfly400 medley800 freestyle