While ABO non-identical blood transfusions are common in trauma patients undergoing massive transfusions, observational studies suggest that non-identical ABO transfusions may increase mortality. Investigators, therefore, retrospectively analyzed 24-hour and in-hospital mortality in 403 trauma patients (2008 to 2020) who received massive transfusions. Overall, 68% (275/403) of patients were alive at 24-hours post-admission and 53% (213/403) at discharge; survival did not…