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Table 6 Multi-level regression analysis for change in swimming speed for the Olympic Champions 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 0.004 0.001 0.826 2.862 0.064
   100 0.004 0.001 0.909 3.496 0.040
   200 0.004 0.001 0.923 4.636 0.019
   400 0.003 0.001 0.847 2.710 0.073
   800 0.001 0.001 0.483 1.083 0.358
   1500 0.002 0.001 0.898 2.561 0.083
  Female 50 0.004 0.001 0.884 2.822 0.067
   100 0.003 0.000 0.914 8.164 0.004
   200 0.003 0.001 0.737 2.468 0.090
   400 0.002 0.000 1.010 4.756 0.018
   800 0.002 0.001 0.891 3.354 0.044
   1500 - - - - -
Breaststroke Male 100 0.003 0.001 0.758 5.260 0.013
   200 0.003 0.001 0.798 2.410 0.095
  Women 100 0.003 0.000 1.003 8.998 0.003
   200 0.004 0.001 1.053 3.885 0.030
Backstroke Male 100 0.003 0.001 0.769 4.159 0.025
   200 0.004 0.001 0.961 6.540 0.007
  Women 100 0.003 0.001 0.839 2.966 0.059
   200 0.002 0.001 0.684 1.604 0.207
Butterfly Male 100 0.004 0.001 0.844 4.513 0.020
   200 0.004 0.001 1.030 3.669 0.035
  Women 100 0.004 0.002 0.778 2.057 0.132
   200 0.003 0.001 0.958 5.700 0.011
Individual medley Male 200 0.005 0.001 0.956 6.424 0.008
   400 0.004 0.001 0.962 5.072 0.015
  Women 200 0.002 0.001 0.500 2.025 0.136
   400 0.002 0.000 0.696 6.724 0.007