Research Article

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

Table 6

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

Cutoff point (sec)Sensitivity (%)Specificity (%)PPVNPVLR+LR−AUCYouden’s index

≥2073.558.611.596.81.780.450.660.32
≥2164.774.415.696.62.520.480.70.39
≥2264.774.615.796.62.540.470.730.39
≥2358.876.515.596.22.50.540.680.35

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).