Table 4 Accuracy of the nomogram in estimating the risk of PONV
Variable | Training cohort | Validating cohort |
|---|---|---|
Area under the ROC curve, concordance index | 0.832 (0.771–0.893) | 0.827 (0.722–0.932) |
Hosmer–Lemeshow test | 0.212 | |
Cut-off score | 102.813 | 97.882 |
Youden index | 0.572 | 0.550 |
Sensitivity, % | 0.769 | 0.765 |
Specificity, % | 0.804 | 0.786 |
Positive predictive value, % | 0.694 | 0.591 |
Negative predictive value, % | 0.857 | 0.892 |
Positive likelihood ratio | 3.916 | 3.569 |
Negative likelihood ratio | 0.287 | 0.299 |