Table 3.
AUROC of single continuous feature at SVM model for three AHI cutoffs
| Order | AHI ≥ 5/h | AHI ≥ 15/h | AHI ≥ 30/h | |||
|---|---|---|---|---|---|---|
| Feature | AUROC | Feature | AUROC | Feature | AUROC | |
| 1 | Waist | 0.794 | Waist | 0.763 | Waist | 0.754 |
| 2 | BMI | 0.772 | Neck | 0.747 | Neck | 0.742 |
| 3 | Neck | 0.769 | BMI | 0.739 | BMI | 0.736 |
| 4 | Age | 0.665 | Age | 0.561 | Age | 0.584 |
| Features not selected | ||||||
| 5 | SOL | 0.525 | Frequency of nocturia | 0.520 | Frequency of nocturia | 0.510 |
| 6 | Frequency of nocturia | 0.513 | ESS | 0.516 | ESS | 0.518 |
| 7 | Frequency of awakening in sleep | 0.513 | Frequency of awakening in sleep | 0.494 | Frequency of awakening in sleep | 0.503 |
| 8 | ESS | 0.495 | SOL | 0.488 | SOL | 0.493 |
The features were in order according to the AUROC value. In the first stage of feature selection, features with AUROC higher than median were selected.