Girls, Girls, XXs...
October 27, 2004 9:34 AM Subscribe
or: Partnership status and the human sex ratio at birth: a paper by Karen Norberg
Could the sex of a child be influenced by the status of the parents' relationship at the time of conception? In a sample of 86,436 births in the United States, we find a small excess of sons among births to parents who were married or living with an opposite sex partner before the child's conception, compared to births to parents who were not. This is the first evidence that household arrangements can affect the human sex ratio at birth, and could explain the fall in the proportion of male births in some developed countries over the past thirty years.
(Data published on FirstCite
via The Economist
(special note for mathowie: No word yet as to whether or not those single moms can also reliably produce offspring with an astigmatism.)
posted by lilboo (12 comments total)