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KMID : 1159120180250040809
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Korean Journal of Rehabilitation Psychology
2018 Volume.25 No. 4 p.809 ~ p.822
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The Sensitivity and Specificity of the Cognition Scale for Older Adults (COSA) in the Detection of Dementia
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Kim Hong-Keun
Kim Yong-Suk
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Abstract
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The present study examined the validity of the Cognition Scale for Older Adults (COSA) for the detection of dementia. Participants included older adults, 93 with dementia and 86 without, as diagnosed using the Global Deterioration Scale. The COSA assesses cognitive ability in eight domains and within each domain, produces one score adjusted for age level only (A-type score) and another score adjusted for age and education levels (B-type score). The COSA follows an algorithm-like flowchart that evaluates multiple B-type scores in a stepwise manner to detect dementia. Results indicated the following: sensitivity of 91.4%, specificity of 95.3%, positive predictive value of 95.5%, negative predictive value of 91.1%. Of the eight domains, the Full-scale Intelligence Quotient, Executive Intelligence Quotient, and Memory Function Index had the highest diagnostic validity. B-type scores generally had higher validity than A-type scores. In conclusion, the COSA flowchart method demonstrated high validity for the detection of dementia. This likely reflects multiple factors including the stepwise consideration of multiple major scores, the use of dual cutoffs, and norms adjusted for both age and education level.
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KEYWORD
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dementia, memory function, executive function, validity, older adult
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