Cohort progression — KS Płetwal Zakopane
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 butterfly200 freestyle50 breaststroke50 backstroke100 breaststroke100 backstroke100 medley400 freestyle200 medley100 butterfly200 backstroke25 freestyle200 breaststroke25 backstroke800 freestyle25 breaststroke25 butterfly400 medley
Cohorts to compare: 2017 52015 82014 32013 42012 32011 52010 122009 72008 62007 72006 72005 82004 32003 32002 3
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014 born 2013