Table 5. Predicting obstructive sleep apnea with the various possible scores on the Portuguese-language version of the STOP-Bang questionnaire (n = 456), by degree of severity.a .
| OSA severity | High-risk patientsb | Low-risk patientsb | OR | LR+ | LR− | Post-test probability |
|---|---|---|---|---|---|---|
| AHI ≥ 5 events/h | ||||||
| ≥ 1 vs. < 1 | 454 (99.6) | 2 (0.4) | 3.63 (0.09-134.11) | 1.00 (0.99-1.02) | 0.27 (0.00-10.11) | 78.3 |
| ≥ 2 vs. < 2 | 423 (92.8) | 33 (7.2) | 5.06 (2.31-11.12) | 1.17 (1.07-1.27) | 0.23 (0.11-0.46) | 80.8 |
| ≥ 3 vs. < 3 | 352 (77.2) | 104 (22.8) | 4.20 (2.52-7.03) | 1.53 (1.28-1.85) | 0.36 (0.26-0.51) | 84.7 |
| ≥ 4 vs. < 4 | 267 (58.6) | 189 (41.4) | 6.22 (3.65-10.66) | 2.68 (1.92-3.91) | 0.43 (0.36-0.52) | 90.6 |
| ≥ 5 vs. < 5 | 161 (35.3) | 295 (64.7) | 5.79 (2.88-11.91) | 3.78 (2.13-7.17) | 0.65 (0.60-0.73) | 93.2 |
| ≥ 6 vs. < 6 | 79 (17.3) | 377 (82.7) | 3.98 (1.60-10.52) | 3.37 (1.49-8.48) | 0.84 (0.80-0.93) | 92.4 |
| ≥ 7 vs. < 7 | 26 (5.7) | 430 (94.3) | 3.49 (0.78-21.79) | 3.32 (0.79-20.30) | 0.95 (0.93-1.01) | 92.3 |
| 8 vs. < 8 | 4 (0.9) | 452 (99.1) | 0.83 (0.07-20.95) | 0.83 (0.07-20.73) | 1.00 (0.98-1.03) | 75.0 |
| AHI ≥ 15 events/h | ||||||
| ≥ 1 vs. < 1 | 454 (99.6) | 2 (0.4) | ∞ (0.26-∞) | 1.00 (0.99-1.00) | 0.00 (0.00-3.73) | 52.0 |
| ≥ 2 vs. < 2 | 423 (92.8) | 33 (7.2) | 4.42 (1.78-11.47) | 1.10 (1.04-1.14) | 0.24 (0.10-0.58) | 54.4 |
| ≥ 3 vs. < 3 | 352 (77.2) | 104 (22.8) | 4.21 (2.52-7.07) | 1.36 (1.23-1.49) | 0.32 (0.21-0.48) | 59.6 |
| ≥ 4 vs. < 4 | 267 (58.6) | 189 (41.4) | 5.21 (3.40-8.00) | 1.97 (1.66-2.34) | 0.37 (0.29-0.48) | 68.1 |
| ≥ 5 vs. < 5 | 161 (35.3) | 295 (64.7) | 4.45 (2.85-6.96) | 2.70 (1.99-3.72) | 0.60 (0.53-0.69) | 74.5 |
| ≥ 6 vs. < 6 | 79 (17.3) | 377 (82.7) | 4.59 (2.47-8.61) | 3.63 (2.13-6.39) | 0.79 (0.74-0.86) | 79.7 |
| ≥ 7 vs. < 7 | 26 (5.7) | 430 (94.3) | 5.50 (1.75-19.18) | 5.08 (1.70-17.28) | 0.92 (0.90-0.96) | 84.6 |
| 8 vs. < 8 | 4 (0.9) | 452 (99.1) | 2.79 (0.25-70.25) | 2.77 (0.26-69.10) | 0.99 (0.98-1.01) | 75.0 |
| AHI ≥ 30 events/h | ||||||
| ≥ 1 vs. < 1 | 454 (99.6) | 2 (0.4) | ∞ (0.09-∞) | 1.00 (0.98-1.00) | 0.00 (0.00-10.13) | 28.5 |
| ≥ 2 vs. < 2 | 423 (92.8) | 33 (7.2) | ∞ (2.93-∞) | 1.11 (1.06-1.11) | 0.00 (0.00-0.36) | 30.7 |
| ≥ 3 vs. < 3 | 352 (77.2) | 104 (22.8) | 8.88 (3.62-23.16) | 1.36 (1.25-1.42) | 0.15 (0.06-0.34) | 35.2 |
| ≥ 4 vs. < 4 | 267 (58.6) | 189 (41.4) | 9.60 (5.12-18.27) | 1.92 (1.70-2.10) | 0.20 (0.11-0.33) | 43.4 |
| ≥ 5 vs. < 5 | 161 (35.3) | 295 (64.7) | 5.90 (3.71-9.41) | 2.73 (2.15-3.41) | 0.46 (0.36-0.58) | 52.1 |
| ≥ 6 vs. < 6 | 79 (17.3) | 377 (82.7) | 5.20 (3.02-8.96) | 3.68 (2.42-5.61) | 0.70 (0.62-0.80) | 59.5 |
| ≥ 7 vs. < 7 | 26 (5.7) | 430 (94.3) | 7.80 (3.00-21.05) | 6.80 (2.78-17.54) | 0.87 (0.83-0.93) | 73.0 |
| 8 vs. < 8 | 4 (0.9) | 452 (99.1) | 7.67 (0.70-193.35) | 7.52 (0.70-187.51) | 0.98 (0.97-1.00) | 75.0 |
OSA: obstructive sleep apnea; LR: likelihood ratio; and AHI: apnea-hypopnea index. aData are presented as n (%) or as estimated value (95% CI). bPatients were classified as being at high- or low-risk of OSA according to whether their score on STOP-Bang questionnaire was above or below the cut-off of 3 points, respectively.