Cohort progression — Poland
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 breaststroke100 backstroke200 freestyle100 breaststroke200 breaststroke50 butterfly100 butterfly400 freestyle200 medley50 backstroke200 backstroke200 butterfly400 medley50 manikin carry1500 freestyle200 obstacle swim800 freestyle100 manikin carry with fins
Cohorts to compare: 2008 62007 32006 72005 62004 32003 32002 92001 112000 111999 261998 161997 291996 161995 171994 41993 31988 31983 31967 141962 151959 191954 161949 101944 91939 4