Table 7.
Diagnostic ability of the SBQ scores from 1 to 8 at AHI cutoff points 5, 15 and 30 (n = 237)
| SBQ score cutoff | n (%) | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) |
|---|---|---|---|---|---|
| Any OSA (AHI ≥ 5) | |||||
| 1 | 165 (69.6) | 100.0 (97.8–100.0) | 1.4 (0.04 –7.5) | 69.9 (69.3–70.5) | 100.0 |
| 2 | 163 (68.8) | 98.8 (95.7–99.9) | 11.1 (4.9–20.7) | 71.8 (70.1–73.5) | 80.0 (46.6–94.8) |
| 3 | 152 (64.1) | 92.1 (86.9–95.7) | 44.4 (32.7–56.6) | 79.2 (75.5–82.4) | 71.1 (57.9–81.5) |
| 4 | 125 (52.7) | 75.8 (86.5–82.1) | 61.1 (48.9–72.4) | 81.7 (76.7–85.8) | 52.4 (44.2–60.4) |
| 5 | 75 (31.6) | 45.5 (37.7–53.4) | 84.7 (34.1–92.1) | 87.2 (79.4–92.3) | 40.4 (36.4–44.6) |
| 6 | 43 (18.1) | 36.1 (29.3–43.4) | 93.5 (82.1–98.6) | 95.8 (88.3–98.6) | 26.1 (23.6–28.7) |
| 7 | 18 (7.6) | 10.9 (6.6–16.7) | 98.6 (92.5–99.7) | 94.7 (71.0–99.3) | 32.6 (31.4–44.71) |
| 8 | 3 (1.2) | 1.8 (0.4–5.2) | 100.0 (95.0–100.0) | 100.0 | 30.8 (30.3–31.2) |
| Moderate and severe OSA (AHI ≥ 15) | |||||
| 1 | 112 (47.3) | 100.0 (96.8–100.0) | 0.8 (0.02–4.4) | 47.5 (47.1–47.9) | 100.0 |
| 2 | 112 (47.3) | 100.0 (96.8–100.0) | 8.0 (3.9–14.22) | 49.3 (48.1–50.6) | 100.0 |
| 3 | 109 (46.0) | 97.3 (92.4–99.4) | 33.6 (25.4–42.6) | 56.8 (53.6–59.9) | 93.3 (81.7–97.8) |
| 4 | 94 (39.7) | 83.9 (75.8–90.2) | 52.8 (43.7–61.8) | 61.4 (56.6–66.1) | 78.6 (70.0–85.2) |
| 5 | 61 (25.8) | 54.5 (44.8–63.9) | 80.0 (71.9–86.6) | 70.9 (62.3–78.3) | 66.2 (61.1–71.0) |
| 6 | 38 (16.0) | 33.9 (25.3–43.5) | 93.6 (87.8–97.2) | 82.6 (69.8–90.7) | 61.3 (57.9–64.5) |
| 7 | 17 (7.2) | 15.2 (9.1–23.2) | 98.4 (94.3–99.8) | 89.5 (66.8–97.3) | 56.4 (54.4–58.4) |
| 8 | 3 (1.2) | 2.7 (0.6–7.6) | 100.0 (97.1–100.0) | 100.0 | 53.4 (52.7–54.2) |
| Severe OSA (AHI ≥ 30) | |||||
| 1 | 60 (25.3) | 100.0 (94.0–100.0) | 0.6 (0.01–3.1) | 25.4 (25.2–25.6) | 100.0 |
| 2 | 60 (25.3) | 100.0 (94.0–100.0) | 5.6 (2.7–10.1) | 26.4 (25.7–27.1) | 100.0 |
| 3 | 59 (24.9) | 98.3 (91.1–99.9) | 24.9 (18.7–31.9) | 30.7 (28.8–32.7) | 97.8 (86.1–99.7) |
| 4 | 54 (22.8) | 90.0 (79.5–96.2) | 44.1 (36.6–51.7) | 35.3 (31.8–38.9) | 92.9 (85.7–96.6) |
| 5 | 37 (15.6) | 61.7 (48.2–73.9) | 72.3 (65.1–78.8) | 43.0 (35.6–50.7) | 84.8 (80.0–88.6) |
| 6 | 27 (11.4) | 45.0 (32.1–58.4) | 89.3 (83.8–93.4) | 58.7 (46.1–70.3) | 82.7 (79.1–85.8) |
| 7 | 17 (7.2) | 28.3 (17.5–41.4) | 98.9 (96.0–99.9) | 89.5 (66.9–97.3) | 80.3 (77.6–82.7) |
| 8 | 3 (1.2) | 5.0 (1.0–13.9) | 100.0 (97.9–100.0) | 100.0 | 76.0 (70.0–81.3) |