Evaluating the spectrum concept of schizophrenia in the Roscommon Family Study
1995; American Psychiatric Association; Volume: 152; Issue: 5 Linguagem: Inglês
10.1176/ajp.152.5.749
ISSN1535-7228
AutoresK. S. Kendler, Michael C. Neale, Dermot Walsh,
Tópico(s)Schizophrenia research and treatment
ResumoBack to table of contents Previous article Next article No AccessEvaluating the spectrum concept of schizophrenia in the Roscommon Family StudyPublished Online:1 Apr 2006https://doi.org/10.1176/ajp.152.5.749AboutSectionsView articleAbstractPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail View articleAbstractOBJECTIVE: The authors sought to evaluate whether the pattern of schizophrenia and related disorders in probands and their relatives can be explained by a single underlying continuum of liability to the "schizophrenia spectrum." METHOD: In the epidemiologically based Roscommon Family Study, the authors separately examined--in siblings, parents, and relatives of index and comparison probands--the familial aggregation and coaggregation of five hierarchically defined disorders: schizophrenia, schizoaffective disorder, schizotypal/paranoid personality disorder, other nonaffective psychoses, and psychotic affective illness. A multiple threshold model was fitted to these contingency tables by maximum likelihood. RESULTS: The multiple threshold model that constrained resemblance to be the same in siblings and parents fit the data well and estimated the correlation in liability to schizophrenia spectrum disorders between probands and first-degree relatives at 0.36. Parents, however, required higher levels of liability to manifest schizophrenia spectrum disorders than siblings. While schizophrenia and psychotic affective illness could be clearly assigned to the two extremes of the schizophrenia spectrum, the proper ordering of schizoaffective disorder, schizotypal/paranoid personality disorder, and other nonaffective psychoses could not be unambiguously determined. CONCLUSIONS: These results are consistent with the existence of a schizophrenia spectrum in which these five disorders are manifestations, of varying severity, of the same underlying vulnerability. 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