title: Comparison of pervasive developmental disorder and schizophrenia by the Japanese version of the National Adult Reading Test.
abstract: OBJECTIVE
  In adults, it is sometimes difficult to discriminate between pervasive developmental disorder (PDD) and schizophrenia (SCH) when positive symptoms are not outstanding. We examined whether the Japanese version of the National Adult Reading Test (JART), is a valid scale for evaluating pre-morbid intelligence quotient (IQ) in patients with SCH, and the Wechsler Adult Intelligence Scale-Revised (WAIS-R) are useful for helping to discriminate between PDD and SCH.
  
  
  METHODS
  Sixteen patients with adult PDD and 16 age-, education- and sex-matched patients with SCH participated in the present study. In addition, two groups were matched for JART and GAF scores. All subjects were scored on the JART and WAIS-R after informed consent on the aim of this study. Examiners who were blind to the diagnoses measured JART and WAIS-R.
  
  
  RESULTS
  Significant diagnosis-by-IQ examination interactions were found (F[1,30] = 10.049, P = 0.003). Furthermore, WAIS-R scores of the PDD group were higher than those of the SCH group (P = 0.002) considering two groups were matched for JART.
  
  
  CONCLUSIONS
  The comparison of IQ in the PDD group and in the SCH group by JART and WAIS-R might be an easy and useful method for helping to discriminate between PDD and SCH.
authors.affiliation: Department of Psychiatry, Nara Medical University School of Medicine, Nara, Japan. toyosaku@naramed-u.ac.jp
authors.forename: Toyosaku
authors.initials: T
authors.lastname: Ota
authors.forename: Junzo
authors.initials: J
authors.lastname: Iida
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sawada
authors.forename: Yuko
authors.initials: Y
authors.lastname: Suehiro
authors.forename: Naoko
authors.initials: N
authors.lastname: Kishimoto
authors.forename: Shohei
authors.initials: S
authors.lastname: Tanaka
authors.forename: Kiyoyuki
authors.initials: K
authors.lastname: Nagauchi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Yamamuro
authors.forename: Hideki
authors.initials: H
authors.lastname: Negoro
authors.forename: Hidemi
authors.initials: H
authors.lastname: Iwasaka
authors.forename: Miyuki
authors.initials: M
authors.lastname: Sadamatsu
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Kishimoto
mesh_terms: D000328:Adult; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007361:Intelligence Tests / Q000592:standards*; D007564:Japan; D008297:Male; D011932:Reading; D012559:Schizophrenia / Q000175:diagnosis*; D014888:Wechsler Scales; D055815:Young Adult