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The Capital Region of Denmark - a part of Copenhagen University Hospital
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The six-item Clock Drawing Test - reliability and validity in mild Alzheimer's disease

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  1. Normative data for eight verbal fluency measures in older Danish adults

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  2. Effects of literacy on semantic verbal fluency in an immigrant population

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  3. Performances on five verbal fluency tests in a healthy, elderly Danish sample

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  4. Performances on Symbol Digit Modalities Test, Color Trails Test, and modified Stroop test in a healthy, elderly Danish sample

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  1. Perceived stress and dementia: Results from the Copenhagen city heart study

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  2. Effects of Tumor Necrosis Factor Antagonists in Patients With Primary Sclerosing Cholangitis

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  3. A Tablet App Supporting Self-Management for People With Dementia: Explorative Study of Adoption and Use Patterns

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This study presents a reliable, short and practical version of the Clock Drawing Test (CDT) for clinical use and examines its diagnostic accuracy in mild Alzheimer's disease versus elderly nonpatients. Clock drawings from 231 participants were scored independently by four clinical neuropsychologists blind to diagnostic classification. The interrater agreement of individual scoring criteria was analyzed and items with poor or moderate reliability were excluded. The classification accuracy of the resulting scoring system - the six-item CDT - was examined. We explored the effect of further reducing the number of scoring items on classification accuracy and estimated classification accuracy associated with performances deviating from the optimal cutoff score. At a cutoff of 5/6, the six-item CDT had a sensitivity (SN) of 0.65 and a specificity of 0.80. Stepwise removal of up to three items reduced SN slightly. Classification accuracy associated with a score of four or less out of six was very high.

Original languageEnglish
JournalNeuropsychology, Development and Cognition. Section B: Aging, Neuropsychology and Cognition
Volume22
Issue number3
Pages (from-to)301-11
Number of pages11
ISSN1382-5585
DOIs
Publication statusPublished - May 2015

ID: 45067616