title: Nithsdale schizophrenia surveys 21: a longitudinal study of National Adult Reading Test stability.
abstract: BACKGROUND
  The stability of the National Adult Reading Test (NART) as a measure of pre-morbid intelligence in schizophrenia has not yet been satisfactorily established despite the widespread use of the NART in schizophrenia research.
  
  
  METHODS
  We examined NART stability in a diverse group of 45 schizophrenic patients in a prospective longitudinal study over 6.5-7.5 years.
  
  
  RESULTS
  The results showed that NART performance does not decline significantly with increasing duration of schizophrenic illness and that test-retest reliability, even over 6.5-7.5 years, is extremely high.
  
  
  CONCLUSIONS
  Our results provide the necessary evidence that the NART can be used as a stable measure of pre-morbid intelligence in schizophrenia.
authors.affiliation: Department of Clinical Research, Crichton Royal Hospital, Dumfries, Scotland.
authors.forename: G
authors.initials: G
authors.lastname: Morrison
authors.forename: V
authors.initials: V
authors.lastname: Sharkey
authors.forename: J
authors.initials: J
authors.lastname: Allardyce
authors.forename: R C
authors.initials: RC
authors.lastname: Kelly
authors.forename: R G
authors.initials: RG
authors.lastname: McCreadie
mesh_terms: D000293:Adolescent; D000328:Adult; D004410:Dyslexia / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007361:Intelligence Tests / Q000592:standards* / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012559:Schizophrenia / Q000150:complications* / Q000175:diagnosis; D012680:Sensitivity and Specificity