Table 6 Evaluation of diagnostic tests for difficult airways
Indicators | TP | TN | FP | FN | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) |
|---|---|---|---|---|---|---|---|---|
RNIIG (≥9.5) | 31 | 112 | 66 | 4 | 88.6% (78.1–99.1%) | 62.9% (55.8–70.0%) | 32.0% (16.1–47.9%) | 96.6% (94.0–99.2%) |
RNTMD (>4.6) | 28 | 112 | 66 | 7 | 80.0% (66.7–93.3%) | 62.9% (55.8–70.0%) | 29.8% (20.6–39.0%) | 94.1% (89.9–98.3%) |
NC (≥41 cm) | 23 | 112 | 66 | 12 | 65.7% (50.0–81.4%) | 62.9% (55.8–70.0%) | 25.8% (16.7–34.9%) | 90.3% (85.1–95.5%) |
MMT (III–IV) | 20 | 127 | 51 | 15 | 57.1% (40.7–73.5%) | 71.3% (64.7–77.9%) | 28.2% (12.8–43.6%) | 89.4% (84.9–93.9%) |
IIG (≤3.5 cm) | 10 | 155 | 23 | 25 | 28.6% (13.6–43.6%) | 87.1% (82.2–92.0%) | 30.3% (14.6–46.0%) | 86.1% (81.0–91.2%) |
TMD (≤7.0 cm) | 7 | 166 | 12 | 28 | 20.0% (6.7–33.3%) | 93.3% (89.6–97.0%) | 36.8% (20.3–53.3%) | 85.6% (80.5–90.7%) |