title: The Prudhoe Cognitive Function Test, a scale to assess cognitive function in adults with Down's syndrome: inter-rater and test-retest reliability.
abstract: BACKGROUND
  The Prudhoe Cognitive Function Test (PCFT) was designed to measure cognitive function in subjects with all degrees of intellectual disability (ID) and to be administered by non-specialist raters. The aim of the present study was to measure the test-retest and inter-rater reliability of the PCFT.
  
  
  METHODS
  Three raters, one a specialist and two non-specialists, administered the PCFT to 14 subjects with Down's syndrome on two occasions separated by 4 weeks.
  
  
  RESULTS
  The intra-class correlation coefficients (ICCs) between the rater pairs (n=3) were 0.99, 0.99 and 0.98 (P<0.01). Floor effects were recorded for two items. The ICC for test-retest reliability was 0.99 (P<0.01).
  
  
  CONCLUSIONS
  The PCFT is a highly reliable instrument when used by either specialist or non-specialist raters. It has excellent temporal stability.
authors.affiliation: Department of Psychiatry, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
authors.forename: M L
authors.initials: ML
authors.lastname: Margallo-Lana
authors.forename: P B
authors.initials: PB
authors.lastname: Moore
authors.forename: S P
authors.initials: SP
authors.lastname: Tyrer
authors.forename: H
authors.initials: H
authors.lastname: Dawson
authors.forename: K
authors.initials: K
authors.lastname: Jenkins
authors.forename: D W K
authors.initials: DW
authors.lastname: Kay
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003071:Cognition; D004314:Down Syndrome / Q000523:psychology*; D005260:Female; D006801:Humans; D007361:Intelligence Tests / Q000592:standards*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results