Fig. 1From: American Society of Anesthesiologists Physical Status Classification as a reliable predictor of postoperative medical complications and mortality following ambulatory surgery: an analysis of 2,089,830 ACS-NSQIP outpatient casesFlow diagram of included and excluded patients. ASA PS American Society of Anesthesiologists Physical Status, NSQIP National Surgical Quality Improvement. Outpatient setting defined as LOS = 0Back to article page