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Analysis of variance shows no significant associations between stature, weight, or body mass index (BMI) and ABO or Rh blood group phenotypes among a sample of mothers in England, Scotland, and Wales whose children were born during March 3-9, 1958. Social factors are significantly associated with stature and weight; the effects of social class of the women’s fathers, regions of birth of the women, their ages, whether their education continued beyond age 16 or not, and the total number of births were separated out by regression analysis. The adjusted residual regression of ABO and Rh phenotypes were not significantly related to reported stature, weight, or BMI.