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Receiver-operating characteristic (ROC) curves for prediction of postoperative in-hospital mortality in (A) patients never admitted to the intensive care unit (ICU) and (B) patients admitted to the ICU during their hospital stay by the American Society of Anesthesiologists Physical Status (ASA PS), the Charlson comorbidity index (CCI), the Charlson CCI for surgical patients (sCCI), and the surgical mortality score (SMS).
