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Investigations of the heredity of psychoses and mental deficiency in two north Swedish parishes


Investigations of the heredity of psychoses and mental deficiency in two north Swedish parishes



Ann Eugenics 6(3): 253-318



DOI: 10.1111/j.1469-1809.1935.tb02114.x

The author estimates that oligophrenia (feeble mindedness) occurred at the rate of 14 per thousand individuals in the 2 isolated parishes, as compared with 2.2 per thousand in the general rural population of Sweden. Similarly the incidence of psychoses is about 7 per thousand in the parishes as compared with 2.7 in the rest of Sweden. It is concluded that oligophrenia is determined by "one or more rare autosomal recessive genes and by one or more, relatively more common, sex-linked, also recessive genes.".

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