Table 3 Variable values to predict difficult laryngoscopy (n = 2522).
From: Observation of the validity of the upper lip bite test in predicting difficult intubation
Variables | Adjusted odds ratio (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) |
|---|---|---|---|---|---|
Age > 52 y | 1.5(1.1–2.1) | 0.56(0.48–0.63) | 0.61(0.59–0.63) | 0.10(0.08–0.12) | 0.95(0.93–0.96) |
ULBT > 2 grade | 2.9(1.8–4.1) | 0.21(0.15–0.27) | 0.96(0.95–0.97) | 0.27(0.21–0.35) | 0.94(0.94–0.94) |
Mouth opening < 4.0 cm | 4.6(3.2–6.6) | 0.73(0.66–0.80) | 0.72(0.70–0.74) | 0.17(0.15–0.18) | 0.97(0.96–0.98) |
Thyromental distance < 7.0 cm | 1.9(1.3–2.6) | 0.42(0.35–0.50) | 0.82(0.80–0.83) | 0.15(0.13–0.18) | 0.95(0.94–0.95) |
Modified Mallampati test > 2 grade | 2.9(2.1–4.1) | 0.45(0.38–0.53) | 0.85(0.84–0.87) | 0.19(0.16–0.22) | 0.95(0.95–0.96) |
