The Prudhoe Cognitive Function Test, a scale to assess cognitive function in adults with Down's syndrome: inter-rater and test-retest reliability.
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.
Margallo-Lana
M L
ML
Department of Psychiatry, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
Moore
P B
PB
Tyrer
S P
SP
Dawson
H
H
Jenkins
K
K
Kay
D W K
DW
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