Cohort progression — Zagrebački plivački klub
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 butterfly50 breaststroke100 freestyle50 backstroke200 medley200 freestyle100 butterfly100 medley100 breaststroke100 backstroke200 backstroke200 breaststroke400 freestyle200 butterfly