title: The relationship of catatonia symptoms to symptoms of schizophrenia.
abstract: OBJECTIVE
  To evaluate the relationships of symptoms of catatonic schizophrenia to 77 symptoms relevant for diagnosing schizophrenia and to socioanamnestic variables.
  
  
  METHODS
  Data from a sample of 112 Canadian patients diagnosed with schizophrenia according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) were evaluated via phi correlation coefficients.
  
  
  RESULTS
  Forty-five (40.2%) of our 112 patients had catatonic symptoms, either at the time of this study or in the past. However, only weak correlations (phi < 0.31) to other symptoms relevant for diagnosing schizophrenia were found, and no significant correlations to socioanamnestic variables were found.
  
  
  CONCLUSIONS
  Symptoms of catatonia appear to be independent of the key symptoms of schizophrenia.
authors.affiliation: Department of Psychiatry, University of Western Ontario, London. zcernovs@julian.uwo.ca
authors.forename: Z Z
authors.initials: ZZ
authors.lastname: Cernovsky
authors.forename: J A
authors.initials: JA
authors.lastname: Landmark
authors.forename: H
authors.initials: H
authors.lastname: Merskey
authors.forename: R L
authors.initials: RL
authors.lastname: O'Reilly
mesh_terms: D000328:Adult; D000368:Aged; D002389:Catatonia / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data; D011594:Psychometrics; D015203:Reproducibility of Results; D012560:Schizophrenia, Catatonic / Q000145:classification / Q000175:diagnosis* / Q000523:psychology