• Eur J Health Econ · Jul 2019

    Comparative Study

    A head-to-head comparison of five-level (EQ-5D-5L-Y) and three-level EQ-5D-Y questionnaires in paediatric patients.

    • WongCarlos King HoCKHhttp://orcid.org/0000-0002-6895-6071Department of Family Medicine and Primary Care, The University of Hong Kong, Rm 1-01, 1/F, Jockey Club Building for Interdisciplinary Research, 5 Sassoon Road, Pokfulam, Hong Kong SAR, China. carlos, CheungPrudence Wing HangPWHhttp://orcid.org/0000-0002-3213-7373Department of Orthopaedics and Traumatology, The University of Hong Kong, 5/F Professorial Block, Queen Mary Hospital, Pokfulam, Hong Kong SAR, China., Nan Luo, and CheungJason Pui YinJPYhttp://orcid.org/0000-0002-7052-0875Department of Orthopaedics and Traumatology, The University of Hong Kong, 5/F Professorial Block, Queen Mary Hospital, Pokfulam, Hong Kong SAR, China. cheungjp@hku.hk..
    • Department of Family Medicine and Primary Care, The University of Hong Kong, Rm 1-01, 1/F, Jockey Club Building for Interdisciplinary Research, 5 Sassoon Road, Pokfulam, Hong Kong SAR, China. carlosho@hku.hk.
    • Eur J Health Econ. 2019 Jul 1; 20 (5): 647-656.

    PurposeThe aim of this study was to assess the psychometric properties of a youth version of the EQ-5D five-level questionnaire (5LY) and its three-level version (3LY) in a sample of Chinese paediatric patients.MethodsA consecutive sample of idiopathic scoliosis patients were recruited from a referral outpatient scoliosis center at Hong Kong, China in October 2017 and completed the two versions of EQ-5D-Y. Redistribution properties in each dimension of EQ-5D-Y were analyzed between 5LY and 3LY by logistics regressions. Absolute reduction and relative reduction in ceiling effects from the 3LY to the 5LY were calculated. Test-retest reliability was assessed by examining the Gwet's agreement coefficient (Gwet's AC) for five individual dimension responses over the 2-week period.ResultsA total of 129 idiopathic scoliosis patients completed the two versions of EQ-5D-Y at baseline assessment, among which 70 patients completed the test-retest interview in 2-3 weeks after baseline assessment. For redistribution properties, the proportion of inconsistency was low in all the dimensions, ranging from 0.0% ("Usual activities") to 3.9% ("Pain/discomfort"). Ceiling effects were reduced in four dimensions. "Usual activities" dimension showed significant reduction (absolute and relative reductions: 3.9% and 4.3%; p = 0.025) and the "worried/sad/unhappy" dimension showed the largest significant reduction in ceiling effects (absolute and relative reductions: 7.8% and 9.8%; p = 0.012). The 3LY and 5LY showed very good agreement (> 80%) of individual dimension responses between two assessments, except for the "worried/sad/unhappy" dimension in 3LY.ConclusionThrough this head-to-head comparison, the 5LY had significant improvements in ceiling effects in two dimensions when compared to 3LY but other measurement properties of 3LY and 5LY performed similar in the idiopathic scoliosis patient group.

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