Table 2.
General linear model for determining the contribution of 50-, 100-, and 200-m events to top-10 world ranked performances in the 400-mIM. A positive β value indicates an improvement in performance, whereas a negative value indicates a reduction in performance.
| GLOBAL | |||||
|---|---|---|---|---|---|
| Estimate (β) | Std.Error | t value | p-value | R2 | |
| (Intercept) | 919 | 13 | 66.3 | <2e-16 † | 0.43 |
| Age | −1.0 | 0.5 | −2.1 | 0.03 | |
| n50 | 9.1 | 4.9 | 1.9 | 0.07 | |
| n100 | 3.9 | 2.2 | 1.8 | 0.08 | |
| n200 | 7.0 | 1.5 | 4.7 | 7,59e-06 † | |
| Over900_100 | −4.9 | 8.9 | −0.6 | 0.58 | |
| Over900_200 | 13.4 | 3.6 | 3.7 | 0.0003 † | |
| FEMALES | |||||
| (Intercept) | 926 | 28 | 33 | <2e-16 † | 0.49 |
| Age | −1.7 | 0.7 | −2.4 | 0.02 | |
| n50 | 7.8 | 14.4 | 0.6 | 0.54 | |
| n100 | 4.0 | 3.9 | 1.0 | 0.32 | |
| n200 | 5.9 | 2.2 | 2.7 | 0.01 † | |
| Over900_100 | 8.5 | 24.2 | 0.3 | 0.73 | |
| Over900_200 | 9.8 | 5.1 | 1.9 | 0.06 | |
| MALES | |||||
| (Intercept) | 905 | 19 | 47 | <2e-16 | 0.43 |
| Age | −0.30 | 0.7 | −0.5 | 0.61 | |
| n50 | 5.8 | 7.6 | 0.8 | 0.45 | |
| n100 | 3.1 | 2.8 | 1.1 | 0.27 | |
| n200 | 8.2 | 2.2 | 3.7 | 00005 † | |
| Over900_100 | −10.9 | 10.3 | −1.1 | 0.29 | |
| Over900_200 | 17.7 | 5.3 | 3.3 | 00014 † | |
Note: R2: proportion of variance explained for 400-mIM competition performance; Age: age in years of each swimmer; n50: number of 50-m events scoring more than 800 FINA points; n100: number of 100-m events scoring more than 800 FINA points; n200: number of 200-m events scoring more than 800 FINA points; Over100_900: dichotomous variable with a value of 0 or 1. It depends on whether in any of the 100-m tests the score was higher than 900 FINA points or not; Over200_900: dichotomous variable with a value of 0 or 1. Significance. codes: †: p = 0.000