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Receiver-operating characteristics (ROC) curves of model performance, as shown by C-indices and their 95% confidence intervals (CIs), for each postoperative complication: (A) transfusion of over 5 units of blood; (B) bile leakage; (C) unplanned intubation; (D) renal failure; (E) cardiac events; (F) septic shock; and (G) pneumonia.
