Clock Drawing Test in Mild Cognitive Impairment: Quantitative Analysis of Four Scoring Methods and Qualitative AnalysisLee K.S. · Kim E.A. · Hong C.H. · Lee D.-W. · Oh B.H. · Cheong H.-K.
aDepartment of Psychiatry, Yonsei University College of Medicine, bInstitution of Behavioral Science in Medicine, Yonsei University College of Medicine, and cDepartment of Neuropsychiatry, College of Medicine, Inje University, Sanggye Paik Hospital, Seoul, dOccupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency, Incheon, eDepartment of Psychiatry, Ajou University School of Medicine, and fDepartment of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Suwon, Korea
Background: The role of the clock drawing test (CDT) as a screening tool for dementia has been evaluated. However, studies focusing on mild cognitive impairment (MCI) are still lacking. The purpose of this study was to verify the validity of the CDT as a screening method for MCI. Methods: 524 subjects aged 60 years and older were recruited in the community. Of these, 241 were diagnosed as not cognitively impaired (NCI) and 224 were classified as MCI. The CDT was scored according to the Freedman, Rouleau, Todd, and CERAD CDT and an additional comprehensive scoring system incorporating elements of most CDT for qualitative analysis. Results: The sensitivity and specificity of the 4 CDT scoring systems for MCI ranged from 40.7 to 56.4% and from 71.8 to 85.3%, respectively. The likelihood ratio and the positive and negative predictive values of the 4 CDT ranged from 18 to 29, 18.2 to 24.5 and from 55.9 to 78.4%, respectively. In qualitative analysis, a significantly lower performance in the clock numbers category was observed in the MCI group. Conclusion: This study suggests that although some qualitative analyses could help in identifying MCI individuals, the CDT is insufficient as a screening method to distinguish MCI individuals from NCI individuals in a clinical setting.
Hae-Kwan Cheong, MD, DrPH
Department of Social and Preventive Medicine 4303, Sungkyunkwan University School of Medicine, 300 Cheoncheon-dong, Jangan-gu
Suwon-si 440-746 (South Korea)
Tel. +82 31 299 6300, E-Mail email@example.com
Accepted: August 18, 2008
Published online: November 6, 2008
Number of Print Pages : 7
Number of Figures : 0, Number of Tables : 5, Number of References : 31
Dementia and Geriatric Cognitive Disorders
Vol. 26, No. 6, Year 2008 (Cover Date: December 2008)
Journal Editor: Chan-Palay V. (New York, N.Y.)
ISSN: 1420–8008 (Print), eISSN: 1421–9824 (Online)
For additional information: http://www.karger.com/DEM