Cohort progression — K.S. niezrzeszeni.pl
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 200 freestyle100 freestyle200 breaststroke50 freestyle400 freestyle50 breaststroke100 backstroke100 breaststroke50 butterfly50 backstroke200 backstroke200 medley100 butterfly800 freestyle100 medley1500 freestyle
Cohorts to compare: 1983 3