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The British Journal of Psychiatry (1970) 117: 293-301. doi: 10.1192/bjp.117.538.293
© 1970 The Royal College of Psychiatrists
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The Evidence for a Birth Order Factor in Schizophrenia

R. D. HINSHELWOOD B.Sc., M.B., B.S., D.P.M.1

1 Psychiatric Registrar, Marlborough Day Hospital, 38 Marlborough Place, London, N.W.8

The evidence for a birth order factor in schizophrenia is reviewed, and a paradoxical situation is revealed. Previous conclusions pointing to an over-representation of early born from small families and late born from large are confused by the report of a large sample of psychiatric patients by Hare and Price. This showed that similar distortions in birth order distribution occur in the non-schizophrenic patients to a greater extent than in the schizophrenic patients.

An attempt is made to resolve this paradox. The reported distortions are assumed to be a feature of the general population. It is then hypothesized that they are diminished in the schizophrenic sample by a secondary over representation of another intermediate birth position. Evidence is given for a specific over-representation of the last-but-one position in schizophrenic samples.

Submitted on March 31, 1969




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Copyright © 1970 The Royal College of Psychiatrists.