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The Depression-prone and the Depression-resistant Sibling: A Study of 650 Three-Sibling Families
Published online by Cambridge University Press: 29 January 2018
Extract
The relationship between ordinal position of birth and mental illness, and particularly schizophrenia, is a familiar issue to regular readers of this journal. Its significance rests mainly in the fact that on genetic grounds each ordinal position of birth in a sibship is equally vulnerable. Therefore conclusive evidence of a positive relationship between birth order and mental illness, while not excluding the importance of hereditary factors, offers a good indication of the operation of some, possibly early, familial environmental influences.
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- Copyright © Royal College of Psychiatrists, 1968
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