Cohort progression — SSP nr.1 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: 25 breaststroke25 backstroke25 freestyle50 breaststroke50 freestyle50 butterfly50 backstroke25 butterfly
Cohorts to compare: 2011 52010 62009 92008 42007 62006 102005 102004 92003 62002 92001 52000 71999 71997 6
25 m breaststroke men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2010 born 2009 born 2008