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The author has studied the inheritance of psychiatric conditions in the Danish island of Bornholms, which he finds particularly suited for studies of an isolated group. He finds that the expectancy for schizophrenia is 0.65 ± 0.05 per cent and for manic-depressive insanity 0.36 ± 0.04 per cent. These figures are more or less typical of those published by other experimenters. There seems hardly any evidence to suggest that schizophrenia is not recessive and manic-depressive insanity dominant in their characteristic inheritance, according to the author of this statistical monograph.
Beiträge zur psychiatrischen Erblehre auf Grund von Untersuchungen an einer Inselbevölkerung. JAMA. 1939;113(14):1357. doi:10.1001/jama.1939.02800390079041
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