Table 4.
Diagnostic performance of ODI3% and ODI4% to predict severe OSA (OAHI ≥ 10 events/h).
| ODI Threshold (events/h) | Sensitivity | Specificity | PPV | NPV | ||||
|---|---|---|---|---|---|---|---|---|
| ODI3% | ODI4% | ODI3% | ODI4% | ODI3% | ODI4% | ODI3% | ODI4% | |
| ≥ 2 | 97.9 | 95.7 | 25.9 | 48.1 | 69.7 | 76.3 | 87.5 | 86.6 |
| ≥ 3 | 97.9 | 91.5 | 25.9 | 55.6 | 69.7 | 78.2 | 87.5 | 78.9 |
| ≥ 4 | 97.9 | 87.2 | 25.9 | 62.9 | 69.7 | 80.4 | 87.5 | 73.9 |
| ≥ 5 | 95.7 | 80.9 | 44.4 | 70.4 | 75.0 | 82.6 | 85.7 | 67.9 |
| ≥ 6 | 95.7 | 78.7 | 51.9 | 77.8 | 77.6 | 86.0 | 87.5 | 67.7 |
| ≥ 7 | 93.6 | 72.3 | 55.6 | 85.2 | 78.6 | 89.5 | 83.3 | 63.9 |
| ≥ 8 | 91.5 | 70.2 | 66.7 | 85.2 | 82.7 | 89.2 | 81.8 | 62.2 |
NPV = negative predictive value, OAHI = obstructive apnea-hypopnea index, ODI = oxygen desaturation index, ODI3% = oxygen desaturation index ≥ 3%, ODI4% = oxygen desaturation index ≥ 4%, OSA = obstructive sleep apnea, PPV = positive predictive value.