Maternal blood groups and differential fertility: a hospital survey from Lahore.

The present study is based on a sample of 587 mothers and 1656 pregnancies. The results show that Opositive and B-positive mothers are more successful in reproduction and indicate low percentage of prenatal loss (stillbirths+abortions) than mothers from other ABO groups. Favourable age of marriage for O-positive and B-positive mothers is suggested between 15-22 years and 23-30 years respectively. Rh-negative mothers show significantly low livebirths, but higher prenatal loss than Rh-positive mothers. Rh-negative mothers (AB+ Bthan A± 0-) have significantly higher male births than in Rh-positive mothers. (AB + B+ than A++0+). (JPMA 32:2, 1982).