Table 3.
Receiver operating characteristic curve analysis and the optimal thresholds of the SI, MSI, ASI, AMSI, and SIC for predicting in‐hospital mortality
| Threshold | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Youden index | AUC | SE | Lower limit | Upper limit | P value | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SI | 0.96 | 43.6 | 66.7 | 23 | 71 | 0.10 | 0.553 | 0.18 | 0.518 | 0.588 | 0.003 |
| MSI | 1.23 | 52.0 | 59.6 | 29 | 72 | 0.12 | 0.564 | 0.18 | 0.528 | 0.600 | <0.001 |
| ASI | 58.10 | 50.1 | 72.2 | 24 | 75 | 0.22 | 0.654 | 0.16 | 0.621 | 0.686 | <0.001 |
| AMSI | 67.59 | 68.4 | 57.9 | 35 | 79 | 0.26 | 0.667 | 0.17 | 0.634 | 0.700 | <0.001 |
| SIC | 54.22 | 57.8 | 67.3 | 28 | 77 | 0.25 | 0.659 | 0.17 | 0.627 | 0.692 | <0.001 |
Youden index = (sensitivity + specificity) − 1.
Abbreviations: MSI, modified shock index; ASI, adjusted shock index; AMSI, age‐modified shock index; SI, shock index; SIC, shock index‐C; AUC, area under the curve; NPV, negative predictive value; PPV, positive predictive value; SE, standard error.