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The six-item Clock Drawing Test - reliability and validity in mild Alzheimer's disease

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@article{af6a88c465ac4a71a41d3f8af5a1dab7,
title = "The six-item Clock Drawing Test - reliability and validity in mild Alzheimer's disease",
abstract = "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.",
author = "Kasper J{\o}rgensen and Kristensen, {Maria K} and Gunhild Waldemar and Asmus Vogel",
year = "2015",
month = "5",
doi = "10.1080/13825585.2014.932325",
language = "English",
volume = "22",
pages = "301--11",
journal = "Aging, Neuropsychology, and Cognition",
issn = "1382-5585",
publisher = "Psychology Press",
number = "3",

}

RIS

TY - JOUR

T1 - The six-item Clock Drawing Test - reliability and validity in mild Alzheimer's disease

AU - Jørgensen, Kasper

AU - Kristensen, Maria K

AU - Waldemar, Gunhild

AU - Vogel, Asmus

PY - 2015/5

Y1 - 2015/5

N2 - 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.

AB - 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.

U2 - 10.1080/13825585.2014.932325

DO - 10.1080/13825585.2014.932325

M3 - Journal article

VL - 22

SP - 301

EP - 311

JO - Aging, Neuropsychology, and Cognition

JF - Aging, Neuropsychology, and Cognition

SN - 1382-5585

IS - 3

ER -

ID: 45067616