The Prudhoe Cognitive Function Test, a scale to assess cognitive function in adults with Down's syndrome: inter-rater and test–retest reliability

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BackgroundThe 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.MethodsThree 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.ResultsThe 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).ConclusionsThe PCFT is a highly reliable instrument when used by either specialist or non-specialist raters. It has excellent temporal stability.

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