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Nonlinearity addressing by a weighted two-piecewise linear model.
| Outcome: | HPV infection (OR (95% CI), P value) |
|---|---|
| Fitting by standard linear model | |
| Fitting by two-piecewise linear model | 1.0 (0.9, 1.0), 0.199 |
| Inflection point (K) | 10.5 |
| <10.5 | 0.9 (0.9, 1.0), 0.035 |
| ≧10.5 | 1.7 (1.1, 2.8), 0.018 |
| Log-likelihood ratio | 0.011 |
