Table 3.
Predictive parameters of different STOP-Bang score cut-offs. *Percentage out of the 746 patients (n, number of patients in the AHI group who scored the STOP-Bang score indicated or higher). AHI, apnoea–hypopnoea index; PPV, positive predictive value; NPV, negative predictive value
| STOP-Bang score cut-off | n (%)* | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|---|
| All OSA (AHI>5) | |||||
| 1 | 504 (67.6) | 98.8 | 2.5 | 68.7 | 50.0 |
| 2 | 488 (65.4) | 95.7 | 17.8 | 71.6 | 65.6 |
| 3 | 429 (57.5) | 84.1 | 40.3 | 75.3 | 54.0 |
| 4 | 306 (41.1) | 60.0 | 60.6 | 76.7 | 41.2 |
| 5 | 185 (24.8) | 36.3 | 79.7 | 79.4 | 36.7 |
| 6 | 90 (12.1) | 17.7 | 91.5 | 81.8 | 34.0 |
| 7 | 36 (4.8) | 7.1 | 97.5 | 85.7 | 32.7 |
| 8 | 4 (0.5) | 0.8 | 98.7 | 57.1 | 31.5 |
| Moderate/severe OSA (AHI>15) | |||||
| 1 | 285 (38.2) | 97.8 | 0.7 | 16.7 | 61.2 |
| 2 | 283 (37.9) | 86.9 | 1.4 | 6.3 | 58.5 |
| 3 | 256 (34.3) | 68.4 | 10.8 | 17.6 | 55.1 |
| 4 | 195 (26.1) | 44.4 | 32.1 | 26.5 | 51.1 |
| 5 | 126 (16.9) | 23.3 | 56.1 | 31.4 | 45.9 |
| 6 | 64 (8.6) | 10.0 | 77.7 | 35.1 | 41.8 |
| 7 | 25 (3.4) | 3.7 | 91.3 | 37.2 | 40.5 |
| 8 | 1 (0.1) | 0.4 | 98.7 | 14.3 | 61.3 |
| Severe OSA (AHI>30) | |||||
| 1 | 134 (18.0) | 100.0 | 2.0 | 18.3 | 100.0 |
| 2 | 134 (18.0) | 100.0 | 10.5 | 19.7 | 100.0 |
| 3 | 127 (17.0) | 94.8 | 27.6 | 22.3 | 96.0 |
| 4 | 105 (14.1) | 78.4 | 52.0 | 26.3 | 91.6 |
| 5 | 75 (10.1) | 56.0 | 74.2 | 32.2 | 88.5 |
| 6 | 38 (5.1) | 28.4 | 88.2 | 34.6 | 84.9 |
| 7 | 16 (2.1) | 11.9 | 95.8 | 38.1 | 83.2 |
| 8 | 0 (0) | 0 | 98.9 | 0 | 81.9 |