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Estimating a Preference-Based Index for a 5-Dimensional Health State Classification for Asthma Derived from the Asthma Quality of Life Questionnaire

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  • Yaling Yang
  • John E. Brazier
  • Aki Tsuchiya
  • Tracey A. Young

Abstract

Background : This article presents a valuation study to estimate a preference-based index for a 5-dimensional health state classification for asthma (AQL-5D) derived from the Asthma Quality of Life Questionnaire (AQLQ). Methods : A sample of 307 members of the UK general population valued 99 asthma health states selected from the AQL-5D using the time tradeoff technique. Models were estimated to predict all possible 3125 health states defined by the AQL-5D, and the models were compared in terms of their ability to predict mean values for the 99 states. Results : Mean health state values ranged from 0.39 to 0.94 based on an average of 22 valuations per state. A main effects model estimated on mean health state values and adjusted for consistency had the best predictive ability (mean absolute error of 0.047 and only 9/98 states with errors >0.1) and the most logical consistency with levels of the AQL-5D. The low number of valuations per state may have resulted in unreliable estimates for the models. Preference-based condition specific measures are limited in their ability to make cross-disease comparisons. Conclusion : This is the first study to derive a condition-specific preference-based measure from an existing measure of health-related quality of life in asthma for use in economic evaluation.

Suggested Citation

  • Yaling Yang & John E. Brazier & Aki Tsuchiya & Tracey A. Young, 2011. "Estimating a Preference-Based Index for a 5-Dimensional Health State Classification for Asthma Derived from the Asthma Quality of Life Questionnaire," Medical Decision Making, , vol. 31(2), pages 281-291, March.
    • Handle: RePEc:sae:medema:v:31:y:2011:i:2:p:281-291
    DOI: 10.1177/0272989X10379646
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    References listed on IDEAS

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    1. Brazier, John & Ratcliffe, Julie & Salomon, Joshua & Tsuchiya, Aki, 2016. "Measuring and Valuing Health Benefits for Economic Evaluation," OUP Catalogue, Oxford University Press, edition 2, number 9780198725923.
    2. Tsuchiya, A & Brazier, J & McColl, E & Parkin, D, 2002. "Deriving preference-based single indices from non-preference based condition-specific instruments: converting AQLQ into EQ5D indices," MPRA Paper 29740, University Library of Munich, Germany.
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    Cited by:

    1. John Brazier & Donna Rowen & Yaling Yang & Aki Tsuchiya, 2012. "Comparison of health state utility values derived using time trade-off, rank and discrete choice data anchored on the full health-dead scale," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 13(5), pages 575-587, October.
    2. Brazier, John & Rowen, Donna & Tsuchiya, Aki & Yang, Yaling & Young, Tracy A., 2011. "The impact of adding an extra dimension to a preference-based measure," Social Science & Medicine, Elsevier, vol. 73(2), pages 245-253, July.

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