title: Schizophrenia and the myth of intellectual decline.
abstract: OBJECTIVE
  The authors' goal was to investigate the issue of intellectual deterioration in schizophrenia.
  
  
  METHODS
  They examined the childhood IQs of adult patients with schizophrenia who had attended a child psychiatry service where measurement of intelligence was routine. Follow-up IQs of 34 of these patients were obtained an average of 19.4 years later.
  
  
  RESULTS
  The mean child and adult IQs were greater than one standard deviation lower than those of the general population. There were no significant differences between the child and adult IQs, however, suggesting that the impairment in intelligence during childhood was stable over the follow-up period.
  
  
  CONCLUSIONS
  The deficit in intellectual function observed in these patients, and reported in the literature, is lifelong and predates the onset of schizophrenia.
authors.affiliation: Department of Clinical Psychology, Institute of Psychiatry, London, U.K.
authors.forename: A J
authors.initials: AJ
authors.lastname: Russell
authors.forename: J C
authors.initials: JC
authors.lastname: Munro
authors.forename: P B
authors.initials: PB
authors.lastname: Jones
authors.forename: D R
authors.initials: DR
authors.lastname: Hemsley
authors.forename: R M
authors.initials: RM
authors.lastname: Murray
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis / Q000453:epidemiology; D007360:Intelligence; D007361:Intelligence Tests / Q000706:statistics & numerical data*; D008137:Longitudinal Studies; D008297:Male; D012559:Schizophrenia / Q000175:diagnosis*; D012565:Schizophrenic Psychology; D014888:Wechsler Scales / Q000706:statistics & numerical data