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Mean Absolute Difference Between Published and Predicted Percentile Rank is Lower Using Quadratic Modeling.
| Males | Females | |||
|---|---|---|---|---|
| Age | Linear | Quadratic | Linear | Quadratic |
| 25 | 5.46 | 1.20 | 7.04 | 1.20 |
| 35 | 1.17 | 1.01 | 1.68 | 1.67 |
| 45 | 1.99 | 1.22 | 3.28 | 1.36 |
| 55 | 1.07 | 1.26 | 1.09 | 1.39 |
| 65 | 4.17 | 0.78 | 5.16 | 2.06 |
| 75 | 7.33 | 4.25 | 5.22 | 4.98 |
| Mean | 3.53 | 1.62 | 3.91 | 2.11 |
Logistic functions that included a quadratic modeling of age effects resulted in smaller differences between published and predicted percentiles.
