Distribution of ABO and Rhesus Blood Group Phenotypes Among Blood Donors at Bahir Dar Blood Bank, Amhara, Northwest Ethiopia: A Retrospective Cross-Sectional Study.

This study showed that blood group O was the predominant followed by A, B, and AB and most of the blood donors' blood groups were Rh-positive (91.5%). About 68.9% of the total donations were from the first time donor.