Cohort progression — Botkyrka-Rönninge Simsällskap
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 breaststroke100 freestyle50 butterfly50 backstroke25 freestyle100 breaststroke100 butterfly200 freestyle100 medley100 backstroke200 medley200 breaststroke400 freestyle200 butterfly25 butterfly800 freestyle25 breaststroke
Cohorts to compare: 2018 52017 162016 122015 172014 172013 182012 72011 82010 112008 42007 62006 42005 52003 32002 32001 61984 31974 3
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2016 born 2015