Evaluation of different airway tests to determine difficult intubation in apparently normal adult patients undergoing surgical procedures

Table 3 Validity of airway assessment tests for predicting difficult intubations. Area under receiver operating characteristic curve of various airway assessment parameters

	MMT-TP	MMT-NTP	MPT	TMD	SMD
TP	6	9	7	7	8
FP	16	32	7	16	20
TN	129	113	138	129	125
FN	9	6	8	8	7
Accuracy %	84.38	76.25	90.63	85	83.1.3
Sensitivity %	40	60	46.67	46.67	53.33
Specificity %	88.97	77.93	95.17	88.97	86.20
PPV %	27.27	21.95	50	30.43	28.6
NPV %	93.48	94.96	94.52	94.16	94.7
Youden’s index	0.29	0.38	0.42	0.36	0.40
AUC	0.559	0.625	0.781	0.343	0.310
95% CI	0.407–0.710	0.493–0.757	0.655–0.907	0.198–0.488	0.170–0.451

MMT-TP modified Mallampati test with tongue protrusion, MMT-NTP modified Mallampati test without tongue protrusion, MPT mandibular protrusion test, TMD thyromental distance, SMD sternomental distance, TP true positive, FP false positive, TN true negative, FN false negative, PPV positive predictive value, NPV negative predictive value, AUC area under curve, and CI confidence interval

ISSN: 1754-9493