Oh TK, Ryu JH, on Han JW, et al. - This study was carried out to distinguish factors that are independently correlated with the 30-day unplanned readmission rate of patients who underwent elective spine surgery. Researchers conducted a retrospective cohort study in a single tertiary academic hospital to analyze the electronic health records of adult patients aged 18 years or older who had undergone inpatient elective spine surgery under general anesthesia between January 2010 and March 2018. The primary outcome included unplanned readmission within 30 days. The uni- and multivariable logistic regression analyses were applied in the study. Analysis enrolled a sum of 7,025 patients. In this study, 215 patients (3.1%) had unplanned readmission within 30 days after being discharged following elective spine surgery among the patients included in the analysis. The data revealed that preoperative ASA physical status of ≥ 3, diagnosis of cancer, and transfusion of pRBC were correlated with an elevated 30-day unplanned readmission rate after elective spine surgery.