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The Prudhoe Cognitive Function Test, a scale to assess cognitive function in adults with Down's syndrome: inter-rater
M L Margallo-Lana1, P B Moore, S P Tyrer
1Department of Psychiatry, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
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.
