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RESPONSIVENESS OF THE EQ-5D TO CLINICAL CHANGE: IS THE PATIENT EXPERIENCE ADEQUATELY REPRESENTED?

Part of: Special Collection - Methods

Published online by Cambridge University Press:  05 February 2014

David Tordrup ,
Jean Mossman  and
Panos Kanavos
David Tordrup
Affiliation:
LSE Health, London School of Economics
Jean Mossman
Affiliation:
European Brain Council
Panos Kanavos
Affiliation:
Department of Social Policy and LSE Health, London School of Economics
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Abstract

Objectives: In many economic evaluations and reimbursement decisions, quality-adjusted life-years (QALYs) are used as a measure of benefit to assess effectiveness of novel therapies, often based on the EQ-5D 3-level questionnaire. As only five dimensions of physical and mental well-being are reflected in this tool, significant aspects of the patient experience may be missed. We evaluate the use of the EQ-5D as a measurement of clinical change across a wide range of disorders from dermatological (acne) to life-threatening (metastatic cancers).

Methods: We analyze published studies on the psychometric properties of the EQ-5D 3-level questionnaire, extracting information on the Visual Analogue Scale versus Index score, Standardized Response Mean, and Effect Size. These are compared with ranges generally accepted to represent good responsiveness in the psychometric literature.

Results: We find that only approximately one in five study populations report subjective health state valuation of patients within 5 percent of the score attributed by the EQ-5D index, and more than 40 percent of studies report unacceptable ceiling effects. In the majority of studies, responsiveness of the EQ-5D index was found to be poor to moderate, based on Effect Size (63 percent poor–moderate) and Standardized Response Mean (72 percent poor–moderate).

Conclusions: We conclude that the EQ-5D index does not adequately reflect patient health status across a range of conditions, and it is likely that a significant proportion of the subjective patient experience is not accounted for by the index. This has implications for economic evaluations of novel drugs based on evidence generated with the EQ-5D.

Keywords

QALYResponsivenessHealth technology assessmentPatient participationEQ-5D
Type
Methods
Information
International Journal of Technology Assessment in Health Care , Volume 30 , Issue 1 , January 2014 , pp. 10 - 19
Copyright
Copyright © Cambridge University Press 2014 

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