Artikel
Clock Drawing Test: Screening utility for Mild Cognitive Impairment according to different scoring systems – Results of the Leipzig Longitudinal Study of the Aged (LEILA 75+)
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Veröffentlicht: | 20. September 2011 |
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Gliederung
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Objectives: There is a strong demand for screening instruments for mild cognitive impairment (MCI), as a pre-stage of dementia. The clock drawing test (CDT) is widely used to screen for dementia but the utility in screening for MCI is discussed controversially. In particular, it is still questionable which scoring system is the best in order to screen for MCI. We therefore aim to compare the utility of different CDT scoring systems for screening for MCI.
Methods: In a sample of 428 subjects of the LEILA 75+ study, CDT scores of different scoring systems were compared between subjects with and without MCI. Comparison of receiver operating characteristic (ROC; area under the curve, sensitivity, specificity) was performed and interrater reliability was calculated.
Results: The CDT scores differed significantly between MCI and non-MCI subjects according to all scoring systems applied. However, ROC of the CDT scores were not sufficient to reliably screen for MCI.
Conclusions: None of the present CDT scoring systems has got sufficient utility to reliably screen for MCI. Results indicate that the clinical value of the CDT could be improved by having a semiquantitative scoring, a wider score range and focusing on specific details of the clock like the hands and numbers.