“…In this study, we identified that advanced age, female sex, diabetes with chronic complications, and metastatic tumor were consistently predictive of transfusion during spinal surgery, including any allogeneic transfusion and RBC transfusion. Previous data regarding associations between patient characteristics and outcomes in high‐risk surgical patients have been derived primarily from clinical trials, chart review, or administrative databases from a single institution 7‐14 . In such studies of patients undergoing orthopedic surgery, patient factors that have been identified to be associated with increased blood transfusion include baseline Hb, 7,8,11,13 autologous donation status, 8,13 patient weight, 8 patient blood volume, 11 presence of tumor, 13 pulmonary disease, 13 type of surgery, 8,13 and primary versus revision surgery 8 …”