The Performance of the Intubation Difficulty Scale among Obese Parturients Undergoing Cesarean Section

Table 7

The performance of the endotracheal time among obese pregnant patients for detecting difficult intubation based on ROC curve analysis.

Cutoff point (sec)	Sensitivity	Specificity	PPV	NPV	LR+	LR−	AUC	Youden’s index
≥20	78.9	58.6	7.25	98.6	1.91	0.36	0.69	0.38
≥21	78.9	74.4	11.2	98.9	3.08	0.28	0.77	0.54
≥22	78.9	74.6	11.3	98.9	3.1	0.28	0.77	0.54
≥23	78.9	76.5	12.1	98.9	3.36	0.28	0.78	0.55
≥24	68.4	76.9	10.8	98.3	2.97	0.41	0.73	0.45

Note. PPV; positive predictive value, NPV; negative predictive value, LR+; positive likelihood ratio, LR−; negative likelihood ratio, AUC; area under the ROC curve, Youden’s index; = sensitivity + specificity − 1 (its value ranges from 0 to 1; a value of 1 indicates that there are no false positives or false negatives; i.e., the test is perfect).