Cohort progression — SP 51 Lublin
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 backstroke50 breaststroke50 butterfly25 backstroke25 freestyle100 medley100 backstroke
Cohorts to compare: 2015 152014 82013 222012 252011 172010 202009 172008 172007 132006 222005 62003 5
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2013 born 2012