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Table 9 Multi-level regression analysis for changes in sex difference in swimming speed for the world champions in freestyle, breaststroke, backstroke, butterfly and individual medley with correction for multiple participations

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

  β SE ( β) Stand. β T p
50 m freestyle 0.068 0.038 0.555 1.767 0.121
100 m freestyle −0.020 0.056 −0.132 −0.353 0.735
200 m freestyle 0.011 0.076 0.054 0.144 0.889
400 m freestyle −0.110 0.058 −0.580 −1.883 0.102
800 m freestyle −0.017 0.065 −0.097 −0.259 0.803
100 m breaststroke −0.049 0.035 −0.471 −1.413 0.200
200 m breaststroke −0.011 0.038 −0.106 −0.281 0.787
100 m backstroke 0.035 0.046 0.272 0.749 0.478
200 m backstroke 0.055 0.049 0.388 1.113 0.302
100 m butterfly 0.032 0.055 0.214 0.579 0.581
200 m butterfly 0.031 0.061 0.186 0.501 0.632
200 m individual medley 0.076 0.077 0.351 0.993 0.354
400 m individual medley −0.021 0.047 −0.166 −0.444 0.670