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Threshold effect analysis of WWI on OSA using the two-piecewise linear regression model.
| WWI | Adjusted OR (95% CI), p value |
|---|---|
| Fitting by the standard linear model | 1.359 (1.295, 1.426), <0.001 |
| Fitting by the two-piecewise linear model | |
| Inflection point | 11.678 |
| WWI < 1.359 | 1.553(1.456, 1.656), <0.001 |
| WWI > 1.359 | 0.993 (0.886, 1.114), 0.9088 |
| Log likelihood ratio | <0.001 |
