Receiver-operator characteristic curves (ROCs) of the predicting performance of PCI on 30 days mortality.

<p>The curves are based on risk-prediction models incorporating 16 clinical covariates that either include the PCI or did not include PCI. The area under the ROC curve (AUC) for mortalities was 0.841(0.824–0.858) and 0.819(0.799–0.839) for the risk model with and without the PCI separately (both <i>P</i><0.001).