Young, T., Yang, Y., Brazier, J., Tsuchiya, A. and Coyne, K. (2008) Making Rasch decisions: The use of Rasch analysis in the construction of preference based health related quality of life instruments. Discussion Paper. (Unpublished)
Objective: To set out the methodological process for using Rasch analysis alongside traditional psychometric methods in the development of a health state classification that is amenable to valuation.
Methods: The overactive bladder questionnaire is used to illustrate a four step process for deriving a reduced health state classification from an existing nonpreference based health related quality of life instrument. Step I excludes items that do not meet the initial validation process and step II uses criteria based on Rasch analysis and psychometric testing to select the final items for the health state classification. In step III, item levels are examined and Rasch analysis is used to explore the possibility of reducing the number of item levels. Step IV repeats steps I to III on alternative data sets in order to validate the selection of items for the health state classification.
Conclusions: The techniques described enable the construction of a health state classification amenable for valuation exercises that will allow the derivation of preference weights. Thus, the health related quality of life of patients with conditions, like overactive bladder, can be valued and quality adjustment weights such as quality adjusted life years derived.
|Keywords:||Rasch analysis; health related quality of life; condition specific measure; preference-based measures; overactive bladder syndrome|
|Institution:||The University of Sheffield|
|Academic Units:||The University of Sheffield > Faculty of Social Sciences (Sheffield) > Department of Economics (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 11:49|
|Last Modified:||05 Jun 2014 00:53|
|Identification Number:||HEDS Discussion Paper 08/05|