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Can the Clinical Dementia Rating Scale Identify Mild Cognitive Impairment and Predict Cognitive and Functional
Claudia Woolf1, Melissa J Slavin, Brian Draper
1Dementia Collaborative Research Centre, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia.
Background:
The Clinical Dementia Rating Scale (CDR) is used to rate dementia severity. Its utility in diagnosing mild cognitive impairment (MCI) and its predictive value remain unknown.
Aims:
The aim of this study was to examine the association between CDR scores and expert MCI diagnosis, and to determine whether baseline CDR scores were predictive of cognitive or functional decline and progression to dementia over 6 years.
Methods:
At baseline, the sample comprised 733 non-demented participants aged 70-90 years from the longitudinal Sydney Memory and Ageing Study. Global and sum of boxes CDR scores were obtained at baseline. Participants also received comprehensive neuropsychological and functional assessment as well as expert consensus diagnoses at baseline and follow-up.
Results:
At baseline, CDR scores had high specificity but low sensitivity for broadly defined MCI. The balance of sensitivity and specificity improved for narrowly defined MCI. Longitudinally, all baseline CDR scores predicted functional change and dementia, but CDR scores were not predictive of cognitive change.
Conclusion:
CDR scores do not correspond well with MCI, except when MCI is narrowly defined, suggesting that the CDR taps into the more severe end of MCI. All CDR scores usefully predict functional decline and incident dementia.
Insights
The Clinical Dementia Rating Scale (CDR) shows limited use for diagnosing mild cognitive impairment (MCI) but effectively predicts functional decline and dementia risk in older adults.
Area of Science:
- Gerontology
- Neurology
- Cognitive Science
Background:
- The Clinical Dementia Rating Scale (CDR) is a standard tool for assessing dementia severity.
- Its effectiveness in diagnosing mild cognitive impairment (MCI) and predicting future cognitive or functional decline is not well-established.
Purpose of the Study:
- To evaluate the association between CDR scores and expert MCI diagnosis.
- To determine if baseline CDR scores predict cognitive/functional decline and dementia progression over six years.
Main Methods:
- A longitudinal study of 733 non-demented adults aged 70-90 years.
- Collected global and sum of boxes CDR scores, comprehensive neuropsychological/functional assessments, and expert diagnoses at baseline and follow-up.
Main Results:
- CDR scores demonstrated high specificity but low sensitivity for broadly defined MCI, improving with a narrower definition.
- Baseline CDR scores predicted functional decline and dementia, but not cognitive change over time.
Conclusions:
- CDR scores align with MCI only when narrowly defined, indicating it captures more severe MCI cases.
- All CDR score variations are valuable predictors of functional decline and future dementia incidence.
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