The Prevalence of Mild Cognitive Impairment in Diverse Geographical and Ethnocultural Regions: The COSMIC Collaboration

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    Author
    Sachdev, PS; Lipnicki, DM; Kochan, NA; Crawford, JD; Thalamuthu, A; Andrews, G; Brayne, C; Matthews, FE; Stephan, BCM; Lipton, RB; ...
    Date
    2015-11-05
    Source Title
    PLoS One
    Publisher
    PUBLIC LIBRARY SCIENCE
    University of Melbourne Author/s
    MacKinnon, Andrew; Butterworth, Peter
    Affiliation
    Melbourne School of Population and Global Health
    Melbourne Institute of Applied Economic and Social Research
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    Document Type
    Journal Article
    Citations
    Sachdev, P. S., Lipnicki, D. M., Kochan, N. A., Crawford, J. D., Thalamuthu, A., Andrews, G., Brayne, C., Matthews, F. E., Stephan, B. C. M., Lipton, R. B., Katz, M. J., Ritchie, K., Carriere, I., Ancelin, M. -L., Lam, L. C. W., Wong, C. H. Y., Fung, A. W. T., Guaita, A., Vaccaro, R. ,... Santabarbara, J. (2015). The Prevalence of Mild Cognitive Impairment in Diverse Geographical and Ethnocultural Regions: The COSMIC Collaboration. PLOS ONE, 10 (11), https://doi.org/10.1371/journal.pone.0142388.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/258170
    DOI
    10.1371/journal.pone.0142388
    Abstract
    BACKGROUND: Changes in criteria and differences in populations studied and methodology have produced a wide range of prevalence estimates for mild cognitive impairment (MCI). METHODS: Uniform criteria were applied to harmonized data from 11 studies from USA, Europe, Asia and Australia, and MCI prevalence estimates determined using three separate definitions of cognitive impairment. RESULTS: The published range of MCI prevalence estimates was 5.0%-36.7%. This was reduced with all cognitive impairment definitions: performance in the bottom 6.681% (3.2%-10.8%); Clinical Dementia Rating of 0.5 (1.8%-14.9%); Mini-Mental State Examination score of 24-27 (2.1%-20.7%). Prevalences using the first definition were 5.9% overall, and increased with age (P < .001) but were unaffected by sex or the main races/ethnicities investigated (Whites and Chinese). Not completing high school increased the likelihood of MCI (P ≤ .01). CONCLUSION: Applying uniform criteria to harmonized data greatly reduced the variation in MCI prevalence internationally.

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