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A Sex Difference in Blood-Group Frequencies

Abstract

Two or three years ago, when comparatively large bodies of blood-group data were being examined by one of us (R.A.F.), it was noted that at an unexpectedly large number of centres in Yorkshire there were proportionately more women O's than men and more men A's than women.

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FISHER, R., ROBERTS, J. A Sex Difference in Blood-Group Frequencies. Nature 151, 640–641 (1943). https://doi.org/10.1038/151640a0

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