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  • Hammond, A., et al. (author)
  • The reliability and validity of the English version of the Evaluation of Daily Activity Questionnaire for people with rheumatoid arthritis
  • 2015
  • In: Rheumatology. - : Oxford University Press (OUP). - 1462-0324 .- 1462-0332. ; 54:9, s. 1605-1615
  • Journal article (peer-reviewed)abstract
    • Objectives. The Evaluation of Daily Activity Questionnaire (EDAQ) includes 138 items in 14 domains identified as important by people with RA. The aim of this study was to test the validity and reliability of the English EDAQ. Methods. A total of 502 participants completed two questionnaires 3 weeks apart. The first consisted of the EDAQ, HAQ, RA Quality of Life (RAQoL) and the Medical Outcomes Scale (MOS) 36-item Short-Form Health Survey (SF-36v2), and the second consisted of the EDAQ only. The 14 EDAQ domains were tested for: unidimensionality-using confirmatory factor analysis; fit, response dependency, invariance across groups (differential item functioning)-using Rasch analysis; internal consistency [Person Separation Index (PSI)]; concurrent validity-by correlations with the HAQ, SF-36v2 and RAQoL; and test-retest reliability (Spearman's correlations). Results. Confirmatory factor analysis of the 14 EDAQ domains indicated unidimensionality, after adjustment for local dependency in each domain. All domains achieved a root mean square error of approximation <0.10 and satisfied Rasch model expectations for local dependency. DIF by age, gender and employment status was largely absent. The PSI was consistent with individual use (PSI = 0.94 for all 14 domains). For all domains, except Caring, concurrent validity was good: HAQ (r(s) = 0.72-0.91), RAQoL (r(s) = 0.67-0.82) and SF36v2 Physical Function scale (r(s) = -0.60 to -0.84) and test-retest reliability was good (r(s) = 0.70-0.89). Conclusion. Analysis supported a 14-domain, two-component structure (Self care and Mobility) of the EDAQ, where each domain, and both components, satisfied Rasch model requirements, and have robust reliability and validity.
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  • Result 1-1 of 1
Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Nordenskiöld, Ulla, ... (1)
Hammond, A (1)
Tennant, A (1)
Prior, Y. (1)
Hawkins, R. (1)
Tyson, S. F. (1)
University
University of Gothenburg (1)
Language
English (1)
Research subject (UKÄ/SCB)
Medical and Health Sciences (1)
Year

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