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Table 3 Multi-level regression analysis for change in swimming speed for the world 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 0.006 0.001 0.846 3.997 0.007
   100 0.004 0.001 0.768 3.293 0.017
   200 0.004 0.002 0.846 2.797 0.310
   400 0.001 0.001 0.259 0.672 0.527
   800 0.002 0.001 0.593 1.754 0.130
   1500 0.001 0.001 0.514 1.478 0.190
  Female 50 0.004 0.002 0.693 2.206 0.070
   100 0.004 0.001 0.755 2.747 0.033
   200 0.003 0.001 0.694 2.844 0.029
   400 0.005 0.002 1.282 2.335 0.058
   800 0.003 0.000 0.985 7.017 < 0.001
   1500 0.003 0.001 0.906 4.285 0.013
Breaststroke Male 100 0.005 0.001 1.126 6.187 0.001
   200 0.004 0.000 0.926 9.188 < 0.001
  Women 100 0.005 0.001 0.943 7.108 < 0.001
   200 0.004 0.000 0.926 9.188 < 0.001
Backstroke Male 100 0.006 0.001 1.003 8.373 < 0.001
   200 0.005 0.001 0.854 3.346 0.016
  Women 100 0.004 0.001 0.800 3.970 0.007
   200 0.003 0.001 0.730 2.646 0.038
Butterfly Male 100 0.006 0.002 0.827 3.590 0.011
   200 0.003 0.001 0.687 2.049 0.086
  Women 100 0.004 0.000 0.905 9.760 < 0.001
   200 0.003 0.001 0.687 2.049 0.086
Individual medley Male 200 0.006 0.001 1.037 4.527 0.004
   400 0.002 0.001 0.761 2.697 0.036
  Women 200 0.003 0.001 0.754 2.930 0.026
   400 0.003 0.001 0.902 4.589 0.004