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Receiver operating characteristic (ROC) curves for the Surgical Outcome Risk Tool (SORT), American Society of Anesthesiologists Physical Status (ASA-PS) grade and Surgical Risk Scale (SRS) for the validation cohort of 5569 patients undergoing non-cardiac surgery. The areas under the ROC curves were 0·91 (95 per cent c.i. 0·88 to 0·94), 0·87 (0·84 to 0·91) and 0·88 (0·84 to 0·92) respectively
