title: Prevalence of psychotic disorders in patients with obsessive-compulsive disorder.
abstract: BACKGROUND
  The co-occurrence of obsessive-compulsive disorder (OCD) in patients with schizophrenia and related disorders has been increasingly recognized. However, the rate of psychosis comorbidity in OCD patients has yet to be systematically evaluated.
  
  
  METHODS
  The prevalence of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition psychotic disorders was evaluated in 757 subjects consecutively referred to a specialised diagnostic and treatment facility for OCD. Demographic and clinical characteristics were assessed.
  
  
  RESULTS
  Thirteen OCD patients (1.7%) also met the DSM-IV criteria for a psychotic disorder. We found no significant differences in clinical characteristic between OCD patients with and without a psychotic disorder, although patients with OCD and a psychotic disorder more likely used illicit substances and more likely were male.
  
  
  CONCLUSIONS
  Relatively few patients referred to a specialized treatment OCD center suffer from a psychotic disorder.
authors.affiliation: Department of Psychiatry, Academic Medical Centre, Amsterdam. l.dehaan@amc.uva.nl
authors.forename: Lieuwe
authors.initials: L
authors.lastname: de Haan
authors.forename: Christine
authors.initials: C
authors.lastname: Dudek-Hodge
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Verhoeven
authors.forename: Damiaan
authors.initials: D
authors.lastname: Denys
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009426:Netherlands / Q000453:epidemiology; D009771:Obsessive-Compulsive Disorder / Q000150:complications / Q000453:epidemiology*; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000150:complications / Q000453:epidemiology*; D012559:Schizophrenia / Q000150:complications / Q000453:epidemiology; D055815:Young Adult