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KMID : 0605720120180020120
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Journal of the Korean Society of Biological Therapies in Psychiatry
2012 Volume.18 No. 2 p.120 ~ p.128
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Measuring Cognition in Elderly People : Mini-Mental State Examination-Korean Version
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Han Song-Yi
Chang Sung-Man
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Abstract
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Objectives: The Mini-Mental State Examination is arguably the most widely used screening measure for cognitive impairment. The aims of this study are to evaluate the psychometric properties of the Mini-Mental State Examination- Korean Version(MMSE-KC) as a quantitative measure of cognitive ability.
Methods: Data were analyzed from a total of 312 participants age 65 or older from cross-sectional community-based study, which were collected about demographic information and individual item responses to MMSE-KC. Item response theory was used to analyze individual items.
Results: Comparison of the data with a unidimensional 2-parameter model indicated that the total score obtained by summing across all items yields a reliable(0.78) quantitative estimate of global cognitive ability. All items fit the model and together spanned a range of difficulty(threshold parameter) from -3.86(easier) to 1.15(more difficult) logits, and discrimination(slope parameter) from 0.55 to 8.6 logits. The items about ‘recall of three words’ and ‘attention’ were the most difficult items and have most powerful discrimination parameter. Copying pentagons and time(year) orientation were more difficult than the other items. The patients with dementia showed differential item functioning such items as orientation to place, the last two items of ‘recall of three words’, the last two items of ‘attention’, and ‘three stage command’.
Conclusion: The MMSE-KC can provide a reliable and valid quantitative estimate of cognitive ability. More attention should be paid to the difficult items like ‘recall of three words’ and ‘attention’ for the discrimination of dementia from non-dementia people.
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KEYWORD
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MMSE, Dementia, Item response
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