Table A1.
Diagnostic performance in the test set achieved following a spectral and a bispectral approach. The individual performances correspond to each relative power extracted in our previous work. Joint performance was assessed by constructing LDA classifiers.
| Feature/Model | AHI Threshold = 1 e/h | AHI Threshold = 5 e/h | AHI Threshold = 10 e/h | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Se | Sp | Acc | AUC | Se | Sp | Acc | AUC | Se | Sp | Acc | AUC | ||
| RP VLF | 68.9 | 31.6 | 56.3 | 0.518 | 33.0 | 65.0 | 60.2 | 0.456 | 40.6 | 64.2 | 62.1 | 0.495 | |
| Previous work (frequency analysis approach) |
RP LF | 43.5 | 62.9 | 50.1 | 0.557 | 52.7 | 58.4 | 57.6 | 0.590 | 59.4 | 58.4 | 58.5 | 0.666 |
| RP HF | 35.5 | 71.9 | 47.8 | 0.523 | 39.3 | 68.1 | 63.8 | 0.540 | 43.5 | 76.7 | 73.7 | 0.605 | |
| LF/HF | 37.7 | 70.3 | 48.7 | 0.540 | 45.5 | 66.8 | 63.7 | 0.567 | 49.3 | 70.8 | 68.8 | 0.643 | |
| RP BW1 | 66.3 | 45.3 | 59.2 | 0.559 | 65.2 | 54.0 | 55.6 | 0.621 | 69.6 | 52.3 | 53.9 | 0.624 | |
| RP BW2 | 32.7 | 78.1 | 48.1 | 0.591 | 45.5 | 82.0 | 76.6 | 0.670 | 58.0 | 78.2 | 76.4 | 0.751 | |
| RPBWRes | 45.5 | 56.6 | 49.3 | 0.532 | 44.6 | 64.0 | 61.2 | 0.571 | 49.3 | 64.0 | 62.6 | 0.628 | |
| LDA Classic Bands | 25.7 | 81.3 | 44.5 | 0.559 | 46.4 | 72.2 | 68.4 | 0.633 | 50.7 | 75.3 | 73.1 | 0.685 | |
| LDA Bands of Interest | 42.5 | 72.3 | 52.6 | 0.592 | 50.0 | 80.9 | 76.4 | 0.688 | 63.8 | 84.7 | 82.8 | 0.796 | |
| Present work (bispectral analysis approach) |
LDAClassic | 30.1 | 81.3 | 47.4 | 0.601 | 53.6 | 85.3 | 80.6 | 0.779 | 66.7 | 89.7 | 87.6 | 0.847 |
| LDASpecific | 37.9 | 77.3 | 51.3 | 0.615 | 63.4 | 82.8 | 79.9 | 0.792 | 71.0 | 85.9 | 84.5 | 0.842 | |
RP: relative power; VLF: very low frequency; LF: low frequency; HF: high frequency; LDA: linear discriminant analysis; AHI: Apnea–Hypopnea Index. The highest accuracy and AUC in each severity threshold are highlighted in bold.