Figure. Dose-Response Analysis.

Adjusted odds ratios (ORs) of 30-day postoperative venous thromboembolism with increased number of red blood cell (RBC) events intraoperatively or postoperatively vs no intraoperative or postoperative RBC transfusion are shown. The multivariable model was adjusted for age, sex, race, sepsis, length of stay, mechanical ventilation, disseminated cancer, body mass index, work-related relative value unit for the surgery (surrogate for complexity of surgery), and American Society of Anesthesiology severity class and functional status before surgery. Data were derived from the American College of Surgeons’ National Surgical Quality Improvement Program database for 2014.