Cohort progression — SKS 137 Delfin Łódź
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 backstroke50 butterfly50 breaststroke100 backstroke100 breaststroke100 butterfly100 medley200 backstroke200 freestyle200 medley200 breaststroke400 freestyle25 backstroke25 freestyle25 breaststroke25 butterfly200 butterfly400 medley
Cohorts to compare: 2017 212016 152015 192014 192013 92012 102011 122010 302009 192008 312007 192006 162005 52004 132003 142001 202000 241999 151998 191997 101996 41995 4
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2016 born 2015 born 2014