Heterogeneity of cycloid psychoses: A latent class analysis

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Background. Three hypotheses have been proposed in regard to the origin of cycloid psychoses: (1) they are an independent nosological entity; (2) they are atypical cases of affective disorders; and (3) they are a heterogeneous group of disorders. This study examined the heterogeneity hypothesis by attempting to delineate distinct affective and non-affective subgroups. Methods. In 60 cases drawn from a classic study of cycloid psychoses by Perris (1974), latent class analysis was used to delineate subgroups. Results. Two classes were identified in the analysis: one characterized by the convergence of affective symptoms and family history of affective disorders and the other by the relative paucity of such features. Conclusions. Cycloid psychoses are composed of at least two subgroups, distinguishable on the basis of symptoms and family history.

Original languageEnglish (US)
Pages (from-to)721-726
Number of pages6
JournalPsychological medicine
Issue number3
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Applied Psychology
  • Psychiatry and Mental health


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