Table 2. Predictive values for different cut-offs of ODIox for AHI >15 and AHI >5 plus symptoms.
| Predictive values | ODI ≥5 | ODI ≥10 | ODI ≥15 |
|---|---|---|---|
| AHI >15 | |||
| Se (%) | 99.2 | 97.0 | 82.0 |
| Sp (%) | 60.3 | 78.0 | 94.0 |
| PPV (%) | 83.2 | 89.7 | 96.5 |
| NPV (%) | 97.6 | 93.0 | 72.7 |
| Probability (+)/(−) (%) | 79.3/20.7 | 72/28 | 56/44 |
| LR(+)/(−) | 2.5/0.01 | 4.4/0.04 | 14/0.2 |
| OR (95% CI) | 203.5 (26.8–1,543.7) | 115.7 (36.7–364.8) | 74 (24.6–222.8) |
| AUC (95% CI) | 0.8 (0.70–0.87) | 0.875 (0.80–0.94) | 0.9 (0.83–0.93) |
| AHI >5 plus symptoms | |||
| Se (%) | 94.5 | 86.5 | 69.0 |
| Sp (%) | 84.6 | 89.7 | 95.0 |
| PPV (%) | 96.3 | 97.2 | 98.2 |
| NPV (%) | 78.6 | 61.4 | 42.0 |
| Probability (+)/(−) (%) | 79/21 | 72/28 | 56.6/43.7 |
| LR(+)/(−) | 6.10/0.06 | 8.40/0.15 | 13.40/0.32 |
| OR (95% CI) | 94 (31–284) | 56 (18–174) | 41 (9.5–176.6) |
| AUC (95% CI) | 0.89 (0.83–0.97) | 0.88 (0.82–0.95) | 0.82 (0.75–0.90) |
ODI, oxygen desaturation index; ODIox, ODI of oximetry; AHI, apnea hypopnea index; Se, sensitivity; Sp, specificity; PPV, positive predictive value; NPV, negative predictive value; LR, likelihood ratio; OR, odds ratio; CI, confidential interval; AUC, area under the ROC curve.