Disability weight for each level of the Expanded Disability Status Scale in multiple sclerosis

Joong Yang Cho, Keun Sik Hong, Ho Jin Kim, Su Hyun Kim, Ju Hong Min, Nam Hee Kim, Suk Won Ahn, Min Su Park, Jae Young An, Byung Jo Kim, Woojun Kim

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    Background: The Expanded Disability Status Scale (EDSS) is the most widely employed ordinal disability scale in multiple sclerosis (MS). However, how far apart the individual EDSS levels are along the disability spectrum has not been formally quantified. Objectives: The objective of this paper is to generate refined disability weights (DWs) for each of the ordinal EDSS Level . Met ods: We performed the person trade-off (PTO) procedure to derive DWs of five representative EDSS cat gories (2, 4, 6, 7 and 9), and DWs of the remaining EDSS categories were assigned by linear interpolation. The modified Delphi process was used to achieve consensus among raters. Results: DWs were 0.021 for EDSS 2, 0.199 for EDSS 4, 0.313 for EDSS 6, 0.617 for EDSS 7, and 0.96 for EDSS 9. Pane members achieved a high degree of consensus for each DW, as indicated by low coefficients of variation. Conclusions: Our DWs confirmed that EDSS is an ordinal scale with highly variable intervals. The availability of DW for each EDSS level allows direct comparison of each MS outcome state with other health states and provides a foundation for the estimation of the disability-adjusted life-years lost of individual patients.

    Original languageEnglish
    Pages (from-to)1217-1223
    Number of pages7
    JournalMultiple Sclerosis Journal
    Issue number9
    Publication statusPublished - 2014 Aug


    • Expanded Disability Status Scale
    • Multiple sclerosis
    • disability weight

    ASJC Scopus subject areas

    • Neurology
    • Clinical Neurology


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