Model and age group | Primary sample | Cross-validation sample | ||
Adjusted R2 | see mL·min−1 | Adjusted R2 | see mL·min−1 | |
Linear model | ||||
All | 0.55 | 572.89 | 0.54 | 487.84 |
≤20 years | 0.71 | 560.65 | 0.81 | 528.86 |
>20 years | 0.50 | 574.43 | 0.37 | 484.56 |
Polynomial model | ||||
All | 0.56 | 566.20 | 0.57 | 476.72 |
≤20 years | 0.71 | 548.80 | 0.82 | 456.03 |
>20 years | 0.51 | 568.37 | 0.38 | 478.26 |
Additive model | ||||
All | 0.57 | 556.50 | 0.57 | 473.15 |
≤20 years | 0.76 | 495.18 | 0.84 | 420.72 |
>20 years | 0.52 | 563.82 | 0.38 | 476.92 |
see: standard error of the estimate.