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Lifetime co-morbidity of panic attacks and major depression in a population-based study: age of onset

Published online by Cambridge University Press:  09 July 2009

L. Andrade*
Affiliation:
Instituto de Psiquiatria, Universidade de São Paulo, Brazil; Department of Mental Hygiene, School of Hygiene and Public Health, Johns Hopkins University, Baltimore and Henry Ford Health Science Center, Detroit, USA
W. W. Eaton
Affiliation:
Instituto de Psiquiatria, Universidade de São Paulo, Brazil; Department of Mental Hygiene, School of Hygiene and Public Health, Johns Hopkins University, Baltimore and Henry Ford Health Science Center, Detroit, USA
H. D. Chilcoat
Affiliation:
Instituto de Psiquiatria, Universidade de São Paulo, Brazil; Department of Mental Hygiene, School of Hygiene and Public Health, Johns Hopkins University, Baltimore and Henry Ford Health Science Center, Detroit, USA
*
1Address for correspondence: Dr Laura Andrade Instituto de PsiquiatriaHospital das ClínicasFaculdade de MedicinaUniversidade de São PauloCaixa Postal 8091CEP 01065–970São PauloBrazil.

Synopsis

We used survival analysis to test for a suspected effect of co-morbidity of DIS/DSM-III major depression and panic attack on the age of onset of each of these disorders, in a population-based sample from four sites of the National Institute of Mental Health (NIMH) Epidemiologic Catchment Area Program (N = 12668). The possible effects of gender and presence of a co-morbid disorder on age of onset of the single disorders were analysed using the Cox proportion-hazard model, with gender as an explanatory variable and the co-morbid disorders as time-dependent covariates. The disorders begin earlier in life when they are co-morbid than when they occur singly. The occurrence of one disorder increases the chance of occurrence of the other. Females have from 1·7 to almost twice the risk for developing panic and/or depression compared with men, even if the co-morbid disorder precedes the index disorder or is lifetime co-morbid. These findings are compatible with a hypothesis of a higher severity in co-morbid cases when compared with a single disorder.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1996

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