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Table 2 Multi-level regression analyses for change in performance across years for men and women (Model 1) with correction for multiple finishes (Model 2) and with correction for multiple finishes and age of the participants (Model 3)

From: Swimming performances in long distance open-water events with and without wetsuit

Model

β

SE (β)

Stand. ĂŸ

T

P

Annual fastest men competing with wetsuit

1

−9.425

3.189

−0.702

−2.955

0.016

2

−9.425

3.189

−0.702

−2.955

0.016

3

−9.058

3.376

−0.674

−2.683

0.028

Annual fastest men competing without wetsuit

1

0.764

1.913

0.132

0.399

0.699

2

0.764

1.913

0.132

0.399

0.699

3

0.983

2.243

0.170

0.438

0.673

Annual fastest women competing with wetsuit

1

−9.791

9.556

−0.361

−1.025

0.340

2

−9.791

9.556

−0.361

−1.025

0.340

3

−0.323

−0.935

0.386

−0.357

0.991

Annual fastest women competing without wetsuit

1

−3.065

4.682

−0.213

−0.655

0.529

2

−3.065

4.682

−0.213

−0.655

0.529

3

0.204

0.670

0.522

0.231

0.710

Annual fastest three men competing with wetsuit

1

−8.845

3.109

−0.455

−2.845

0.008

2

−8.845

3.109

−0.455

−2.845

0.008

3

−9.848

2.910

−0.507

−3.385

0.002

Annual fastest three men competing without wetsuit

1

−3.945

2.366

−0.287

−1.668

0.105

2

−3.945

2.366

−0.287

−1.668

0.105

3

−4.117

2.500

−0.299

−1.647

0.110

Annual fastest three women competing with wetsuit

1

−1.762

9.149

−0.061

−0.193

0.851

2

−1.762

9.149

−0.061

−0.193

0.851

3

−3.298

8.674

−0.114

−0.380

0.713

Annual fastest three women competing without wetsuit

1

−7.956

2.994

−0.431

−2.657

0.012

2

−7.956

2.994

−0.431

−2.657

0.012

3

−6.875

3.035

−0.372

−2.265

0.031