Regression model coefficients
| Coefficient | (95% CIs) | Variable name |
| Model 1 | Fifty-metre swim times (s) | |
| 4.62 | (2.82 to 6.42) | Constant |
| 1.09 | (1.04 to 1.15) | Personal best time |
| 0.61 | (0.018 to 0.103) | Rank order for individual repetition |
| 0.18 | (−0.001 to 0.37) | Study duration |
| 0.67 | (−234 to 0.368) | Sports drink, 1=yes, 0=no |
| –0.42 | (–0.340 to 0.256) | Water, 1=yes, 0=no |