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Using Rasch analysis to form plausible health states amenable to valuation: the development of CORE-6D from CORE-OM in order to elicit preferences for common mental health problems

Mavranezouli, I., Brazier, J.E., Young, T.A. and Barkham, M. (2009) Using Rasch analysis to form plausible health states amenable to valuation: the development of CORE-6D from CORE-OM in order to elicit preferences for common mental health problems. Discussion Paper. (Unpublished)

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Abstract

Purpose: To describe a new approach for deriving a preference-based index from a condition specific measure that uses Rasch analysis to develop health states.

Methods: CORE-OM is a 34-item instrument monitoring clinical outcomes of people with common mental health problems. CORE-OM is characterised by high correlation across its domains. Rasch analysis was used to reduce the number of items and response levels in order to produce a set of unidimensionally-behaving items, and to generate a credible set of health states corresponding to different levels of symptom severity using the Rasch item threshold map.

Results: The proposed methodology resulted in the development of CORE-6D, a 2-dimensional health state description system consisting of a unidimensionally-behaving 5-item emotional component and a physical symptom item. Inspection of the Rasch item threshold map of the emotional component helped identify a set of 11 plausible health states, which, combined with the physical symptom item levels, will be used for the valuation of the instrument, resulting in the development of a preference-based index.

Conclusions: This is a useful new approach to develop preference-based measures where the domains of a measure are characterised by high correlation. The CORE-6D preference-based index will enable calculation of Quality Adjusted Life Years in people with common mental health problems.

Item Type: Monograph (Discussion Paper)
Keywords: Rasch analysis, health-related quality of life, condition-specific measure, preference-based-health, health states, CORE-6D, CORE-OM, mental health, quality-adjusted life years
Academic Units: The University of Sheffield > University of Sheffield Research Centres and Institutes > Centre for Psychological Services Research (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: 15 Jun 2010 14:54
Last Modified: 08 Feb 2013 17:31
Status: Unpublished
Identification Number: HEDS Discussion Paper 09/09
URI: http://eprints.whiterose.ac.uk/id/eprint/10883

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