Addition of clinical risk scores improves prediction performance of American Society of Anesthesiologists (ASA) physical status classification for postoperative mortality in older patients: a pilot study.

ACS NSQIP and SORT increase the accuracy of ASA score. Revised Lee score cannot be considered a good indicator of postoperative mortality risk since it is primarily the score which indicates risk for cardiovascular complications. Further studies, with a greater number of patients, are needed.