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Development of the Cognitive Test for Severe Dementia
Hiroyuki Tanaka1, Yuma Nagata, Masayasu Uematsu
1Osaka Prefecture University Graduate School of Comprehensive Rehabilitation, Habikino, Japan.
Dementia and Geriatric Cognitive Disorders
|June 6, 2015
Summary
The Cognitive Test for Severe Dementia (CTSD) accurately measures remaining cognitive function in severe dementia patients, unlike other tests that show floor effects. This new tool offers sensitive assessment for profound dementia.
Area of Science:
- Neuroscience
- Gerontology
- Psychometrics
Background:
- Existing cognitive assessments for moderate-to-severe dementia exhibit floor effects.
- These measures struggle to evaluate residual cognitive abilities, particularly in profound dementia cases.
Purpose of the Study:
- To develop and validate the Cognitive Test for Severe Dementia (CTSD).
- To assess the reliability and validity of the CTSD for evaluating cognitive function in severe dementia.
Main Methods:
- The Cognitive Test for Severe Dementia (CTSD) was developed with 13 items across 7 cognitive domains.
- Reliability (Cronbach's α, interrater, test-retest) and validity were examined in participants with severe dementia.
Main Results:
- CTSD demonstrated high internal consistency (Cronbach's α = 0.896) and excellent interrater (0.961) and test-retest (0.969) reliability.
- Strong correlations were found between CTSD and MMSE, SCIS, and HDS-R (r = 0.870–0.922, p < 0.001).
- Unlike other measures, the CTSD did not exhibit floor effects.
Conclusions:
- The CTSD is a reliable and valid tool for assessing cognitive function in severe dementia.
- CTSD sensitively captures remaining cognitive abilities in severe dementia patients.
- The CTSD overcomes the limitations of existing measures, offering improved assessment for profound dementia.
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