Fig. 1

Linear-by-linear association test results of the perioperative and intraoperative complications with the risk-stratified MSAS. (a) Association between perioperative complications and risk-stratified MSAS; (b) association between intraoperative complications and risk-stratified MSAS. The patients with increasing risk-stratified MSASs have a higher incidence of intraoperative complications (b) (p = 0.01). However, this association was not found in the perioperative complications (a) (p = 0.98). MSAS, modified surgical Apgar score