TABLE 2.
Risk factors for severe obstructive sleep apnea as identified by the logistic regression model and the decision tree method.
| Logistic regression model | Decision tree method | |||
|---|---|---|---|---|
| Risk factors | Category | Point a | Category | Point a |
| BMI, kg/m2 | <27 | 0 | <39 | 0 |
| ≥27 | 6 | ≥39 | 8 | |
| SOS | >55 | 0 | – | – |
| ≤55 | 3 | – | – | |
| Mean SpO2, % | – | – | ≥96 | 0 |
| – | – | <96 | 21 | |
| Average SBP, mmHg | – | – | <135 | 0 |
| – | – | ≥135 | 5 | |
| AUC | 0.623 | 0.718 | ||
Abbreviations: AUC, area under the receiver operating characteristic curve; BMI, body mass index; SBP, systolic blood pressure; SOS, Snore Outcomes Survey; SpO2, pulse oximetry.
a
Based on Sullivan's scoring system.