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    Comparison of Rasch and summated rating scales constructed from SF-36 physical functioning items in seven countries: results from the IQOLA Project. International Quality of Life Assessment

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    Authors
    Raczek, Anastasia E.
    Ware, John E. Jr.
    Bjorner, Jakob B.
    Gandek, Barbara
    Haley, Stephen M.
    Aaronson, Neil K.
    Apolone, Giovanni
    Bech, Per
    Brazier, John E.
    Bullinger, Monika
    Sullivan, Marianne
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    UMass Chan Affiliations
    Department of Quantitative Health Sciences
    Document Type
    Journal Article
    Publication Date
    1998-11-17
    Keywords
    Aged
    Aged, 80 and over
    Algorithms
    Cross-Cultural Comparison
    *Health Status Indicators
    Humans
    Middle Aged
    Psychometrics
    *Quality of Life
    Reproducibility of Results
    Translations
    Biostatistics
    Epidemiology
    Health Services Research
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    Link to Full Text
    http://dx.doi.org/10.1016/S0895-4356(98)00112-7
    Abstract
    Rasch models for polytomous items were used to assess the scaling assumptions and compare item response patterns in the 10-item SF-36 physical functioning scale (PF-10) for general population respondents in Denmark, Germany, Italy, the Netherlands, Sweden, the United Kingdom, and the United States. The Rasch model of physical functioning developed in the United States was compared to models for other countries, and each country was compared to a multinational composite. Strong scale congruence across the seven countries was demonstrated; items that varied between countries and from the composite may reflect unique cultural response patterns or differences in translation. Scoring algorithms based on the Rasch model for each country were superior to the current Likert scoring in tests of relative validity (RV) in discriminating among age groups in all countries. In relation to the Likert PF-10 scoring (RV = 1.00), scores estimated using the Rasch rating scale model achieve a median RV of 1.31 (range: 1.01-1.59), while the Rasch partial credit model attained a median RV of 1.44 (range: 1.01-2.23). Rasch models hold good potential for improving health status measures, estimating individual scores when responses to scale items are missing, and equating scores across countries.
    Source
    J Clin Epidemiol. 1998 Nov;51(11):1203-14. Link to article on publisher's site
    DOI
    10.1016/S0895-4356(98)00112-7
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/47415
    PubMed ID
    9817138
    Related Resources
    Link to Article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1016/S0895-4356(98)00112-7
    Scopus Count
    Collections
    Population and Quantitative Health Sciences Publications

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