Predictive value of SII for poor outcomes after PSM
| AUC | Cut-off value (×109 /L) | 95% CI | Sensitivity | Specificity | |
| HVD | 0.774 | 447.9 | 0.751 to 0.832 | 72.2% | 79.4% |
| MVD | 0.792 | 523.5 | 0.678 to 0.906 | 68.2% | 80.5% |
| AVD | 0.727 | 514.1 | 0.613 to 0.842 | 55.0% | 90.6% |
| MVD+AVD | 0.778 | 477.3 | 0.662 to 0.894 | 75.6% | 75.0% |
AUC, area under the curve; AVD, aortic valve disorder; HVD, heart valve diseases; MVD, mitral valve disorder; PSM, propensity score matching; SII, systemic immune-inflammation index.