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Preliminary findings on the reliability and validity of the Cantonese Birmingham Cognitive Screen in patients with acute ischemic stroke

Authors Pan X, Chen H, Bickerton W, Lam Lau JK, Kong AP, Rotshtein P, Guo A, Hu J, Humphreys G

Received 30 March 2015

Accepted for publication 21 April 2015

Published 16 September 2015 Volume 2015:11 Pages 2377—2390

DOI https://doi.org/10.2147/NDT.S85698

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Professor Wai Kwong Tang

Xiaoping Pan,1,* Haobo Chen,1,2,* Wai-Ling Bickerton,2 Johnny King Lam Lau,2 Anthony Pak Hin Kong,3 Pia Rotshtein,2 Aihua Guo,1 Jianxi Hu,1 Glyn W Humphreys4

1Department of Neurology, Guangzhou First People’s Hospital, Guangzhou Medical University, Guangzhou, People’s Republic of China; 2School of Psychology, University of Birmingham, Birmingham, UK; 3Department of Communication Sciences and Disorders, University of Central Florida, Orlando, FL, USA; 4Department of Experimental Psychology, University of Oxford, Oxford, UK

*These authors contributed equally to this work

Background: There are no currently effective cognitive assessment tools for patients who have suffered stroke in the People’s Republic of China. The Birmingham Cognitive Screen (BCoS) has been shown to be a promising tool for revealing patients’ poststroke cognitive deficits in specific domains, which facilitates more individually designed rehabilitation in the long run. Hence we examined the reliability and validity of a Cantonese version BCoS in patients with acute ischemic stroke, in Guangzhou.
Method: A total of 98 patients with acute ischemic stroke were assessed with the Cantonese version of the BCoS, and an additional 133 healthy individuals were recruited as controls. Apart from the BCoS, the patients also completed a number of external cognitive tests, including the Montreal Cognitive Assessment Test (MoCA), Mini Mental State Examination (MMSE), Albert’s cancellation test, the Rey–Osterrieth Complex Figure Test, and six gesture matching tasks. Cutoff scores for failing each subtest, ie, deficits, were computed based on the performance of the controls. The validity and reliability of the Cantonese BCoS were examined, as well as interrater and test–retest reliability. We also compared the proportions of cases being classified as deficits in controlled attention, memory, character writing, and praxis, between patients with and without spoken language impairment.
Results: Analyses showed high test–retest reliability and agreement across independent raters on the qualitative aspects of measurement. Significant correlations were observed between the subtests of the Cantonese BCoS and the other external cognitive tests, providing evidence for convergent validity of the Cantonese BCoS. The screen was also able to generate measures of cognitive functions that were relatively uncontaminated by the presence of aphasia.
Conclusion: This study suggests good reliability and validity of the Cantonese version of the BCoS. The Cantonese BCoS is a very promising tool for the detection of cognitive problems in Cantonese speakers.

Keywords: cerebral infarction, cognitive impairment, neuropsychological testing, validation test, reliability test, Cantonese speakers
 

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