Birth Weights of South African Babies: (II.) Effect of Birth Rank on Birth Weight

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Abstract
In studying birth weights of 3165 European, 1057 negro, 2188 Bantu and 1391 Indian babies the authors found far fewer babies of higher birth rank in the European than in the other groups. Mean birth weight in all groups increased with birth rank up to Rank 4, after which it varied for different groups; the only significant differences being between Rank 1 and the higher ranks. Age distribution of mothers in different ranks may differ as between racial groups, and the effect of this factor has not yet been weighed. The fact that racial differences in mean birth weights were found when comparing various groups of babies of the same birth rank shows that these were not due to racial differences in birth rank distribution.

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