This list was dropped into a spreadsheet and calculated by formula. Women are consistently around 13% slower than men in most events.
Event / Men / --------------------- Women / --------------- % slower
100 - 9.69 Tyson Gay / 10.61 Florence Griffith Joyner - 09%
200 - 19.32 Michael Johnson / 21.34 Florence Joyner - 10%
400 - 43.18 Michael Johnson / 48.70 Sanya Richards - 13%
800 - 1.42.60 Johnny Gray / 1:56.40 Jearl Miles Clark - 13%
1500 - 3.29.30 Bernard Lagat / 3:57.12 Mary Slaney - 13%
Mile Run - 3.46.91 Alan Webb / 4:16.71 Mary Slaney - 13%
3000m - 7.29.00 Bernard Lagat / 8:25.83 Mary Slaney 13%
5000 - 12.53.60 Bernard Lagat / 14:42.64 Molly Huddle - 14%
10K - 26.44.36 Galen Rupp / 30:22.22 Shalane Flanagan 14%
1/2 Marathon - 59.43 Ryan Hall / 1:07.34 Deena Kastor - 13%
Mar - 2.05.38 Khalid Khannouchi / 2:19:36 Deena Kastor 11%