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E-ISSN : 2733-4538
The present study investigates the usefulness of the Clock Drawing Test(CDT) as a tool for the detection of cognitive impairment by examining the association between CDT performance and, the general cognitive function and each cognitive function evaluated by a neuropsychological battery(SNSB-D). Also, this study examines the efficiency of the CDT for differentiating control, mild cognitive impairment(MCI) and Alzheimer's disease(AD). The results of the quantitative analysis of CDT showed significant mean differences across three groups. In the results of the quality analysis of CDT, errors in all types except for size seem to be different in groups and errors in AD groups appear to be a more frequent than in other groups. We found that the CDT score was significantly correlated with the SNSB-D score. The discriminate accuracy of CDT was relatively low in differentiating the MCI from control group, but somewhat better in differentiating the AD from control group and in differentiating the AD from MCI group. This study showed CDT performance reflects general cognitive function and is a useful tool for assessing cognitive impairment. However, CDT is less adequate at differentiating MCI from control group, so if the CDT is used for MCI, there should be special consideration of this finding, with reference to the quantitative analysis of CDT or other screening tests.
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