Young, T., Yang, Y., Brazier, J. and Tsuchiya, A. (2007) The use of Rasch analysis as a tool in the construction of a preference based measure: the case of AQLQ. Discussion Paper. (Unpublished)
The majority of quality of life instruments are not preference-based measures and so cannot be used within cost utility analysis. The Asthma Quality of Life Questionnaire (AQLQ) is one such instrument. The aim of this study was to develop a health state classification that is amenable to valuation from the AQLQ.
Rasch models were applied to samples of responders to the AQLQ with the aim of i) selecting a number of items for a preference based utility measure (AQL-5D), ii) reducing the number of levels for each item to a more manageable number of levels for establishing AQL-5D. Selection of items for the evaluation survey was supported with conventional psychometric criteria for item selection (feasibility, internal consistency, floor and ceiling effects, responsiveness and regression against overall health).
The role of Rasch analysis in reducing the number of item levels to a preconceived target number of levels proved unsuccessful. However, Rasch analysis proved to be a useful tool in assisting in the initial process of selecting items from an existing HRQL instrument in the construction of AQL-5D. The method is recommended for use alongside conventional psychometric testing to aid in the development of preference-based measures.
|Keywords:||Rasch analysis, preference-based measures, asthma, quality of life|
|Institution:||The University of Sheffield|
|Academic Units:||The University of Sheffield > Faculty of Social Sciences (Sheffield) > Department of Economics (Sheffield)
The University of Sheffield > University of Sheffield Research Centres and Institutes > Informatics Collaboratory for the Social Sciences (ICoSS) (Sheffield)
The University of Sheffield > Faculty of Social Sciences (Sheffield) > Informatics Collaboratory for the Social Sciences (ICoSS) (Sheffield)
The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Health and Related Research (Sheffield) > Health Economics and Decision Science > HEDS Discussion Paper Series
|Depositing User:||ScHARR / HEDS (Sheffield)|
|Date Deposited:||18 Jun 2010 11:15|
|Last Modified:||06 Jun 2014 05:40|
|Identification Number:||HEDS Discussion Paper 07/01|