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Adherence to the transfusion policy. Adherence to the assigned RBC transfusion strategy was analyzed by calculating the percentage of correctly administered RBC transfusions in the two study periods. Light gray indicates one RBC unit, dark gray two, and black more than two RBC units per transfusion. Single units were transfused in 25% of the cases during the double-unit period and in 84% during the single-unit period.
