Cohort progression — Wodnik Śrem
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 butterfly100 backstroke50 backstroke100 breaststroke50 breaststroke100 medley100 butterfly200 medley200 freestyle
Cohorts to compare: 2012 152011 312010 202009 232008 132007 212006 182005 132004 252003 242002 212001 202000 121999 211998 211997 4
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2011 born 2010 born 2009