From: Validation of a Risk Stratification Index and Risk Quantification Index for Predicting Patient Outcomes:In-hospital Mortality, 30-day Mortality, 1-year Mortality, and Length-of-stay Anesthes. 2013;119(3):525-540. doi:10.1097/ALN.0b013e31829ce6e6 Figure Legend: Risk Stratification Index in-hospital mortality discrimination and calibration after removal of “self-fulfilling” International Classification of Diseases, Ninth Revision, Clinical Modification codes from Massachusetts General Hospital patient data: receiver operating characteristic curve and calibration plot. Date of download: 1/1/2018 Copyright © 2018 American Society of Anesthesiologists. All rights reserved.