Association between intraoperative variables (mean arterial pressure and administered blood products) and postoperative risk group reclassification.

The first column represents patients that developed postoperative acute kidney injury (AKI), yet were classified as low-risk by the preoperative model. The second column represents patients that did not develop postoperative AKI, but were classified as high-risk by the preoperative model. The boxes represent 95% confidence intervals for the given variables. (A) Patients correctly classified as having high-risk for AKI by the postoperative stacked model tended to have lower mean arterial pressure. (B) Patients correctly classified as having low-risk for AKI by the postoperative stacked model tended to have higher mean arterial pressure. (C) Patients correctly classified as having high-risk for AKI by the postoperative stacked model tended to have greater volumes of administered intraoperative blood products. (D) Patients correctly classified as having low-risk for AKI by the postoperative stacked model tended to have lesser volumes of administered intraoperative blood products.