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Estimating a preference-based index from the Japanese SF-36

Brazier, J.E., Fukuhara, S., Roberts, J., Kharroubi, S., Yamamoto, Y., Ikeda, S., Doherty, J. and Kurokawa, K. (2009) Estimating a preference-based index from the Japanese SF-36. Journal of Clinical Epidemiology, 62 (12). pp. 1323-1331. ISSN 0895-4356

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Objective: The main objective of the study was to estimate a preference-bascd Short Form (SF)-6D index from the SF-36 for Japan and compare it with the UK results.

Study Design and Setting: The SF-6D was translated into Japanese. Two hundred and forty-nine health states defined by this version of the SF-6D were then valued by a representative sample of 600 members of the Japanese general population using standard gamble (SG). These health-state values were modeled using classical parametric random-effect methods with individual-level data and ordinary least squares (OLS) on mean health-state values, together with a new nonparametric approach using Bayesian methods of estimation.

Results: All parametric models estimated on Japanese data were found to perform less well than their UK counterparts in terms of poorer goodness of fit, more inconsistencies, larger prediction errors and bias, and evidence of systematic bias in the predictions. Nonparametric models produce a substantial improvement in out-of-sample predictions. The physical, role, and social dimensions have relatively larger decrements than pain and mental health compared with those in the United Kingdom.

Conclusion: The differences between Japanese and UK valuations of the SF-6D make it important to use the Japanese valuation data set estimated using the nonparametric Bayesian technique presented in this article. (C) 2009 Elsevier Inc. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier. This is an author produced version of a paper subsequently published in Journal of Clinical Epidemiology. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Preference-based measures; QALYs; SF-6D; Bayesian modeling; Japan; Cross-cultural comparisons
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)
Depositing User: Miss Anthea Tucker
Date Deposited: 02 Dec 2009 16:36
Last Modified: 08 Feb 2013 16:59
Published Version: http://dx.doi.org/10.1016/j.jclinepi.2009.01.022
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.jclinepi.2009.01.022
URI: http://eprints.whiterose.ac.uk/id/eprint/10224

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