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Nonlinearity addressing by weighted two-piecewise linear model.
| Outcome | 30-day mortality HR (95% CIs) P value |
|---|---|
| Linear regression model | 0.99 (0.97, 1.00) 0.0370 |
| Two-piecewise linear regression model | |
| Inflection point | 49.4 |
| <49.4 | 0.97 (0.96, 0.99) 0.0011 |
| ≥49.4 | 1.04 (1.01, 1.07) 0.0529 |
| Log likelihood ratio test | 0.012 |
