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The Camberwell Collaborative Depression Study II. Investigation of Family Members

Published online by Cambridge University Press:  02 January 2018

P. McGuffin ,
R. Katz ,
J. Aldrich  and
P. Bebbington
P. McGuffin
Affiliation:
University of Wales College of Medicine
R. Katz
Affiliation:
Institute of Psychiatry
J. Aldrich
Affiliation:
MRC Social Psychiatry Unit, Institute of Psychiatry
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Abstract

Out of a consecutive series of 130 potential probands with recent onsets of depression, 124 were deemed ‘in scope’ for a family interview study of social and genetic influences on depression. We were able to interview first-degree relatives of 83 probands (67% of those families ‘in scope’). Unexpectedly, interviewed first-degree relatives had, on average, a significantly lower occupational status than the depressed probands. However, the rates of depression among the first-degree relatives were high. Based on a PSE-Catego classification, 17.2% of 244 relatives were current ‘cases' of depression at the time of interview. This was significantly greater than the estimated population prevalence. Using a Past History Schedule in combination with the PSE, the lifetime prevalence of depressive illness, expressed as the proportion who had ever fulfilled PSE-Catego case criteria, was 38.9%. High rates of psychiatric treatment were also found in family members. The lifetime prevalence of any form of hospital treatment for depression in 315 first-degree relatives was 15.5%. This gives an age-corrected morbidity risk to age 65 years of 24.6%, as compared with a population estimate of 8.9%. In common with previous studies, significantly higher rates of depression were found among female than among male first-degree relatives for broader categories of disorder, but there was a small and non-significant excess of men among those relatives who had received in-patient treatment for depression. This apparent lessening of sex differences with more severe categories was not supported by an examination of ‘lifetime ever’ depressive symptoms, where severity was expressed as highest ever PSE-Catego-ID level. Here the proportion of women who had ever had depressive symptoms remained higher throughout the upper range of the Index of Definition. The findings raise the possibility that male relatives of depressed probands under-report their symptoms, but that their doctors compensate by adopting a lower threshold of psychiatric referral when faced with depressive symptoms in a man.

Type
Research Article
Information
The British Journal of Psychiatry , Volume 152 , Issue 6 , June 1988 , pp. 766 - 774
Copyright
Copyright © Royal College of Psychiatrists, 1988 

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