Large families reduce the chances of survival for parents, according to a new study by researchers at the University of Utah (the U). The study, published in the current issue of The Proceedings of the National Academy of Sciences (PNAS) and entitled “Differential fitness costs of reproduction between the sexes,” analyzed data from over 21,000 couples married between 1860 and 1895 identified in the Utah Population Database. The research team, led by Dr. Ken Smith at the University of Utah and Dr. Dustin Penn at the Konrad Lorenz Institute of Ethology, found that the more children couples had, the greater their risk of mortality.
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