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Threshold effect analysis of the relationship between hemoglobin concentration and the risk of hypertension.
| The risk of hypertension | ||
|---|---|---|
| Hemoglobin concentration (g/L) | OR (95%CI) | P value |
| Fitting model by two‐piecewise linear regression | ||
| Inflection point (K) | 176 | |
| <176 slope 1 | 1.01 (1.00–1.02) | 0.0009 |
| >176 slope 2 | 1.04 (1.02–1.06) | <0.0001 |
| Effect difference between slope 2 and slope 1 | 1.03 (1.01–1.05) | 0.0062 |
| Logarithm likelihood ratio test | 0.005 | |
