Regression model (regression coefficients)
| Proximal level | Distal level | Total | ||||
| Coeffiecient βi | p Value | Coefficient βi | p Value | Coefficient βi | p Value | |
| (Constant) | β0 = 45.1 | <0.001 | β0 = 32.9 | <0.001 | β0 = 39.1 | <0.001 |
| Length (cm) | β1 = 5.3 | <0.001 | β1 = 3.4 | 0.005 | β1 = 4.2 | <0.001 |
| Model | SPA = 45.1 + 5.3(long – 4.0) | SPA = 32.9 + 3.4(long – 3.9) | SPA = 39.1 + 4.2(long – 4.0) | |||
| R2 | 0.667 | 0.422 | 0.442 | |||
βi, Lineal regression model coefficients; R2, fit goodness coefficient. SPA, sports participation absence.