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Frequency of RBC minor antigen mismatches per transfusion episode, comparing transfusions that had category 1 level of antigen matching versus category 2. Antigens for which all patients were antigen positive (i.e. k, Kpb, Coa, Hy, LWa, Sc1),antigens that were serologically matched in for all transfusion episodes (i.e. K), and antigens that were not fully characterized in the units (RhD, C/c, E/e) were excluded.
