Table 1 Multi-level regression analysis for changes in swimming speed for the finalists in the FINA World Championships in freestyle, breaststroke, backstroke, butterfly and individual medley with correction for multiple participations and age of the athletes

Freestyle

Male

50

0.006

0.001

0.812

10.487

< 0.001

100

0.005

0.000

0.803

11.396

< 0.001

200

0.004

0.001

0.675

7.528

< 0.001

400

0.002

0.000

0.496

4.719

< 0.001

800

0.004

0.001

0.651

6.958

< 0.001

1500

0.002

0.000

0.503

4.714

< 0.001

Female

50

0.005

0.001

0.698

8.175

< 0.001

100

0.004

0.001

0.749

9.154

< 0.001

200

0.003

0.000

0.689

7.828

< 0.001

400

0.003

0.000

0.731

8.480

< 0.001

800

0.002

0.000

0.590

5.925

< 0.001

1500

0.003

0.001

0.544

4.601

< 0.001

Breaststroke

Male

100

0.003

0.000

0.814

11.718

< 0.001

200

0.003

0.000

0.816

11.719

< 0.001

Women

100

0.005

0.000

0.816

11.719

< 0.001

200

0.003

0.000

0.684

7.247

< 0.001

Backstroke

Male

100

0.005

0.000

0.847

12.895

< 0.001

200

0.004

0.000

0.704

8.243

< 0.001

Women

100

0.005

0.000

0.797

10.525

< 0.001

200

0.003

0.000

0.684

7.247

< 0.001

Butterfly

Male

100

0.005

0.001

0.803

10.281

< 0.001

200

0.003

0.000

0.641

6.845

< 0.001

Women

100

0.005

0.000

0.814

11.074

< 0.001

200

0.004

0.001

0.707

7.997

< 0.001

Individual medley

Male

200

0.005

0.001

0.749

9.189

< 0.001

400

0.003

0.000

0.561

5.633

< 0.001

Women

200

0.004

0.000

0.700

7.810

< 0.001

400

0.003

0.000

0.657

7.110

< 0.001