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Table 4 Multi-level regression analysis for changes in swimming speed for finalists in the Olympic Games in freestyle, breaststroke, backstroke, butterfly and individual medley with correction for multiple participations and age of the athletes

From: Changes in sex difference in swimming speed in finalists at FINA World Championships and the Olympic Games from 1992 to 2013

Stroke Sex Distance (m) β SE ( β) Stand. β T p
Freestyle Male 50 0.005 0.001 0.856 9.415 < 0.001
   100 0.004 0.000 0.841 10.247 < 0.001
   200 0.003 0.000 0.671 6.030 < 0.001
   400 0.002 0.000 0.530 4.087 < 0.001
   800 0.002 0.000 0.537 4.245 < 0.001
   1500 0.002 0.000 0.623 5.282 < 0.001
  Female 50 0.004 0.001 0.718 6.840 < 0.001
   100 0.003 0.000 0.800 8.683 < 0.001
   200 0.003 0.000 0.785 8.254 < 0.001
   400 0.002 0.000 0.703 6.790 < 0.001
   800 0.002 0.000 0.620 5.832 < 0.001
   1500 - - - - -
Breaststroke Male 100 0.003 0.000 0.779 7.649 < 0.001
   200 0.003 0.000 0.801 8.939 < 0.001
  Women 100 0.003 0.000 0.799 8.689 < 0.001
   200 0.003 0.000 0.889 10.386 < 0.001
Backstroke Male 100 0.004 0.000 0.763 8.171 < 0.001
   200 0.004 0.001 0.711 6.761 < 0.001
  Women 100 0.004 0.000 0.823 9.141 < 0.001
   200 0.003 0.001 0.662 5.902 < 0.001
Butterfly Male 100 0.004 0.000 0.863 10.782 < 0.001
   200 0.004 0.000 0.866 10.489 < 0.001
  Women 100 0.004 0.000 0.740 7.850 < 0.001
   200 0.003 0.000 0.731 7.083 < 0.001
Individual medley Male 200 0.003 0.000 0.733 7.130 < 0.001
   400 0.003 0.001 0.624 5.447 < 0.001
  Women 200 0.004 0.001 0.779 7.723 < 0.001
   400 0.003 0.000 0.674 6.199 < 0.001