We have studied the impact of natural selection on the Italian population, analysing the relationship between stillbirth and three related variables: birth weight, birth order and maternal age. A progressive relaxation of selection with time has been demonstrated by the reduction of the Haldane index calculated with respect to the three variables.
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| http://dx.doi.org/10.1046/j.1469-1809.1998.6210047.x | DOI Listing |
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