Screening for normal cognition, mild cognitive impairment, and dementia with the Korean dementia screening questionnaire

Sun Ju Lee, Jung Hoon Han, Jung Won Hwang, Jong Woo Paik, Changsu Han, Moon Ho Park

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)


    Objective The Korean Dementia Screening Questionnaire (KDSQ) is an informant-based instrument used to screen for cognitive dysfunction. However, its ability to only dichotomously discriminate between dementia and normal cognition has been previously investigated. This study investigated the ability of the KDSQ to classify not only dichotomous but also multiple stages of cognitive dysfunction. Methods We examined 582 participants. Receiver operating characteristic (ROC) curves were used to determine dichotomous classification parameters. Multi-category ROC surfaces were evaluated to classify the three stages of cognitive dysfunction. Results Dichotomous classification using the ROC curve analyses showed that the area under the curve was 0.92 for dementia for subjects without dementia and 0.96 for dementia in controls. Simultaneous multi-category classification analyses showed that the volume under the ROC surface (VUS) was 0.57 and that the derived optimal cut-off points were 2 and 8 for controls, MCI, and dementia. The estimated Youden index for the KDSQ was 0.48, and the derived optimal cut-off points were 5 and 10. The overall classification accuracy of the VUS and Youden index was 61.2% and 58.6%, respectively. Conclusion The KDSQ is useful for classifying dichotomous and multi-category stages of cognitive dysfunction.

    Original languageEnglish
    Pages (from-to)384-389
    Number of pages6
    JournalPsychiatry Investigation
    Issue number4
    Publication statusPublished - 2018 Apr

    Bibliographical note

    Funding Information:
    This study was supported by the Korea University Research Fund.

    Publisher Copyright:
    © 2018 Korean Neuropsychiatric Association.


    • Classifying
    • Dement
    • KDSQ
    • Mild cognitive impairment
    • Screening

    ASJC Scopus subject areas

    • Psychiatry and Mental health
    • Biological Psychiatry


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