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Nonlinearity addressing of total flavonoid intake (natural log transformation) and risk of hypertension.
| Risk of hypertension | |
|---|---|
| Outcome: | OR, 95% CI, p |
| Fitting model by standard linear regression | 0.95 (0.92–0.98) < .01 |
| Fitting model by two‐piecewise linear regression | |
| Inflection point | 2.92 |
| < Inflection point | 0.98 (0.92–1.05) .54 |
| ≥ Inflection point | 0.92 (0.88–0.97) < .01 |
| p for the log‐likelihood ratio test | .25 |
The adjustment strategy is the same as the Model 2.
