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The Endogenous Sub-type of Depression: A Study of its Internal Construct Validity

Published online by Cambridge University Press:  29 January 2018

Michael A. Young*
Affiliation:
Departments of Psychiatry and Psychology, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois, 60612, USA
William A. Scheftner
Affiliation:
Department of Psychiatry, Rush-Presbyterian-St Luke's Medical Center, Chicago, Illinois, 60612, USA
Gerald L. Klerman
Affiliation:
Department of Psychiatry, Harvard Medical School, Boston, Massachusetts, USA
Nancy C. Andreasen
Affiliation:
Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa, USA
Robert M. A. Hirschfeld
Affiliation:
Center for Studies of Affective Disorders, Clinical Research Branch, Division of Extramural Research Programs, National Institute of Mental Health, Rockville, Maryland, USA
*
Correspondence

Abstract

The internal construct validity of the endogenous sub-type of major depression was investigated by statistically modelling the RDC endogenous and DSM-III melancholia diagnostic criteria. Data consisted of symptom ratings on 788 patients with major depression from NIMH Collaborative Depression Study. Results indicated that the symptoms in the criteria do not specify a dichotomous classification, melancholic-non-melancholic or endogenous-nonendogenous. Results did support the existence of two sub-typings, one related to anhedonia, and one related to vegetative symptoms. The vegetative sub-type rarely occurred in non-anhedonic patients. Previous studies may have found support for a simple endogenous sub-type because of this hierarchical relationship and as a result of methodological differences.

Type
Papers
Copyright
Copyright © 1986 The Royal College of Psychiatrists 

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Footnotes

From the National Institute of Mental Health, Clinical Research Branch, Collaborative Program on the Psychobiology of Depression: Clinical Studies.

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