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    SHEDDING NEW LIGHT ONTO THE CEILING AND FLOOR? A QUANTILE REGRESSION APPROACH TO COMPARE EQ-5D AND SF-6D RESPONSES

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    Author
    Seymour, J; McNamee, P; Scott, A; Tinelli, M
    Date
    2010-06-01
    Source Title
    HEALTH ECONOMICS
    Publisher
    WILEY
    University of Melbourne Author/s
    Scott, Anthony; Seymour, Janelle
    Affiliation
    General Practice
    Metadata
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    Document Type
    Journal Article
    Citations
    Seymour, J., McNamee, P., Scott, A. & Tinelli, M. (2010). SHEDDING NEW LIGHT ONTO THE CEILING AND FLOOR? A QUANTILE REGRESSION APPROACH TO COMPARE EQ-5D AND SF-6D RESPONSES. HEALTH ECONOMICS, 19 (6), pp.683-696. https://doi.org/10.1002/hec.1505.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/30418
    DOI
    10.1002/hec.1505
    Abstract
    An important issue in the measurement of health status concerns the extent to which an instrument displays lack of sensitivity to changes in health status at the extremes of the distribution, known as floor and ceiling effects. Previous studies use relatively simple methods that focus on the mean of the distribution to examine these effects. The aim of this paper is to determine whether quantile regression using longitudinal data improves our understanding of the relationship between quality of life instruments. The study uses EQ-5D and SF-36 (converted to SF-6D values) instruments with both baseline and follow-up data. Relative to ordinary least least-squares (OLS), a first difference model shows much lower association between the measures, suggesting that OLS methods may lead to biased estimates of the association, due to unobservable patient characteristics. The novel finding, revealed by quantile regression, is that the strength of association between the instruments is different across different parts of the health distribution, and is dependent on whether health improves or deteriorates. The results suggest that choosing one instrument at the expense of another is difficult without good prior information surrounding the expected magnitude and direction of health improvement related to a health-care intervention.
    Keywords
    Applied Economics

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