title: The frequency of multiple personality disorder among psychiatric inpatients.
abstract: OBJECTIVE
  A 2-year study was undertaken to determine the frequency of multiple personality disorder among general adult psychiatric inpatients.
  
  
  METHODS
  All individuals admitted to two 23-bed acute care wards in a teaching hospital in Winnipeg, Man., were screened with the Dissociative Experiences Scale. Individuals with prior diagnoses of multiple personality disorder were excluded. All subjects scoring 20 or higher on the Dissociative Experiences Scale were interviewed with the Dissociative Disorders Interview Schedule. Then subjects with a diagnosis of multiple personality disorder and comparison subjects were interviewed by a clinician who was blind to all research data.
  
  
  RESULTS
  A total of 299 subjects completed the Dissociative Experiences Scale and 80 received a structured diagnostic interview. Ten subjects (3.3%) had clinically confirmed multiple personality disorder.
  
  
  CONCLUSIONS
  If these results are replicated and accepted, multiple personality disorder will become a serious consideration in the differential diagnosis of many psychiatric patients.
authors.affiliation: Department of Psychiatry, University of Manitoba, Winnipeg.
authors.forename: C A
authors.initials: CA
authors.lastname: Ross
authors.forename: G
authors.initials: G
authors.lastname: Anderson
authors.forename: W P
authors.initials: WP
authors.lastname: Fleisher
authors.forename: G R
authors.initials: GR
authors.lastname: Norton
mesh_terms: D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D004213:Dissociative Disorders / Q000175:diagnosis; D009105:Dissociative Identity Disorder / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006760:Hospitalization; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000150:complications*; D008875:Middle Aged; D015995:Prevalence; D011569:Psychiatric Status Rating Scales