Impact of blood group
There have been 31 women with blood group A, from whom 28 got pregnant, 21 gave birth (68 %), ten had aborts (32 %). Of the nine women with blood group B, four gave birth (44 %), and 5 had aborts (56 %). Of the 14 women with blood group O, 12 gave birth (86 %), and four had aborts (29 %). Only three women had blood group AB, from whom two gave birth (67 %), no woman had an abort (0 %), and one did not get pregnant (table 2).
A chi-square test was used to compare blood group and successful pregnancies. Four cell frequencies were below 5, and the results showed no significant correlation with χ²(1) = 2·401, p(χ²) = 0·493, p(Fisher’s exact test) = 0·518, V = 0·205.