Table 3.

Comparison of sex, BMI, MMT, DSE and the best model for predicting a difficult laryngoscopy

Metric	Sex (Male)	BMI ≥ 25	MMT ≥ III	DSE > 2.36	Best Model
Sensitivity (95% CI)	0.614 (0.548–0.679)	0.386 (0.321–0.452)	0.750 (0.692–0.808)	0.818 (0.766–0.870)	0.909 (0.870–0.948)
Specificity (95% CI)	0.611(0.545–0.677)	0.731 (0.671–0.790)	0.713 (0.652–0.774)	0.856 (0.809–0.904)	0.904 (0.864–0.944)
PPV (95% CI)	0.294 (0.232–0.355)	0.274 (0.214–0.334)	0.407 (0.341–0.474)	0.600 (0.534–0.666)	0.714 (0.653–0.775)
NPV (95% CI)	0.857 (0.810–0.904)	0.819 (0.767–0.871)	0.915 (0.878–0.953)	0.947 (0.917–0.977)	0.974 (0.953–0.996)
Kappa	0.160 (0.043–0.278)	0.819 (0.767–0.871)	0.353 (0.230–0.476)	0.595 (0.463–0.727)	0.739 (0.606–0.873)
Youden	0.224	0.117	0.463	0.6745	0.8132
OR (95% CI)	2.492 (1.258–4.937)	1.707 (0.849–3.431)	7.437 (3.471–15.936)	26.813 (11.102–64.756)

Abbreviations: BMI Body mass index, MMT Modified mallampatia test, DSE Distance from skin to epiglottis, NPV Negative predictive value, PPV Positive predictive value, OR Odds ratio, CI Confidence interval