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

Table 5

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

Cutoff point	Sensitivity (%)	Specificity (%)	PPV	NPV	LR+	LR−	AUC	Youden’s index
≥1	100	63.6	10.1	100	2.75	0	0.82	0.64
≥2	100	91.7	46.3	100	12.0	0	0.96	0.95
≥5	100	100	100	100	—	0	1.0	1.0
≥6	68.4	100	100	98.7	—	0.32	0.84	0.21

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).