Table 3: The frequencies of ABO blood types of groups.

CAE group Control group P value
(n = 310) (n = 310)
A, n % 92 (29.6) 81 (26.1) 0.135
B, n % 85 (27.4) 89 (28.7) 0.465
AB, n % 68 (21.9) 64 (20.6) 0.498
O, n % 65 (20.9) 76 (24.5) 0.228