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Threshold analysis.
| Outcome | Effect | P |
| Model 1 fitting model by standard linear regression | 1.12 (1.04–1.19) | 0.001 |
| Model 2 fitting model by two-piecewise linear regression | ||
| Inflection point | 4.21 | |
| PLR < 4.21 | 1.56 (1.21–2.01) | <0.001 |
| PLR ≥ 4.21 | 0.97 (0.86–1.10) | 0.637 |
| P for likelihood test | <0.001 |
Bold values indicate P < 0.05 and are statistically significant.
