Background: Hypothermia is a common clinical issue during the perioperative period.The patients with perioperative inadvertent hypothermia are associated with higher risk of postoperative complications and higher hospitalisation costs. Aims:The aim of this study is to explore the prevalence of and predictors for hypothermia in patients entering postanaesthesia care unit. Design: Retrospective cohort study.Methods: A rigorous retrospective cohort study was conducted according to the STROBE reporting checklist. A total of 7216 patients were enrolled in this study. The perioperative variables potentially related to hypothermia were collected. Univariate analysis and multivariate logistic regression analysis were performed to investigate the contributing factors. Results:The overall prevalence of inadvertent hypothermia in postanaesthesia care unit was 21.3% (n = 1505). The multivariate logistic regression analysis showed that