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The British Journal of Psychiatry (1970) 117: 303-308. doi: 10.1192/bjp.117.538.303
© 1970 The Royal College of Psychiatrists
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Sibship Size and Mental Illness

JOHN BIRTCHNELL M.D., D.P.M., Dip.Psychother.1

1 Medical Research Council, Clinical Research Fellow, M.R.C. Clinical Psychiatry, Research Unit, Graylingwell Hospital, Chichester, Sussex

1. This study is based on a sample of 6,795 psychiatric referrals to the North-Eastern Region of Scotland and of 3,425 subjects from the general population.

2. In both the psychiatric and the control sample a marked and significant relationship was demonstrated between year of birth and family size.

3. In the psychiatric sample an equally marked and significant relationship was demonstrated between social class of parent and family size.

4. The family size distributions of the psychiatric and control samples were strikingly similar, suggesting that there is no relationship between mental illness and family size.

5. When allowance was made for differences in age distribution among diagnostic groups the diagnostic distribution within each family size group did not differ from the expected.

Submitted on October 27, 1969




This article has been cited by other articles:


Home page
 Human RelationsHome page
J. S. B. Lindsay
On the Number and Size of Subgroups
Human Relations, December 1, 1976; 29(12): 1103 - 1114.
[Abstract] [PDF]


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Copyright © 1970 The Royal College of Psychiatrists.