ABO Blood Groups Rh-positive Rh-negative A 61 (20.0%) 5 (1.6 %) B 76 (24.9%) 4(1.3%) AB 15 (4.9 %) 0 (0 %) O 144 (45.9%) 4 (1.3%)

Table 4: Rh-factor in different ABO blood groups, The RhD+ and RhD- distribution varies among the four (4) ABO blood groups.