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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