Journal Article

Age-at-First-Registration for Affective Psychosis and Schizophrenia

Joy L. Welham, Richard J. Thomis and John J. McGrath

in Schizophrenia Bulletin

Published on behalf of Maryland Psychiatric Research Center

Volume 30, issue 4, pages 849-853
Published in print January 2004 | ISSN: 0586-7614
Published online January 2004 | e-ISSN: 1745-1701 | DOI: http://dx.doi.org/10.1093/oxfordjournals.schbul.a007137
Age-at-First-Registration for Affective Psychosis and Schizophrenia

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We compared the age-at-first-registration for patients with schizophrenia and affective psychosis in a statewide mental health register. After excluding those receiving (1) a diagnosis of both schizophrenia (ICD-9 295.x) and affective psychosis (ICD-9 296.x), or (2) a diagnosis of ICD-9 296.1 (which can cover “major depressive episode”), we adjusted the distributions for the age structure of the background general population. We found that all distributions showed a wide age range of onset, with a similar male modal age group of 20–24 for schizophrenia and 25–29 for affective psychosis. The female modal age group was 50–54 for both diagnoses. Although more individuals were diagnosed with schizophrenia (males= 2,434, females= 1,609) than with affective psychosis (males= 670, females = 913), the shape of the two distributions was similar. This finding suggests that factors influencing age-at-first-registration for schizophrenia and affective psychosis may be similar, especially for females.

Keywords: Schizophrenia; affective psychosis; age at onset; gender differences

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Subjects: Child and Adolescent Psychiatry

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