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Mean Rank, Equipercentile, and Regression Mapping of World Health Organization Quality of Life Brief (WHOQOL-BREF) to EuroQoL 5 Dimensions 5 Levels (EQ-5D-5L) Utilities

Author

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  • Hwee Lin Wee

    (Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore
    Saw Swee Hock School of Public Health, National University of Singapore, Singapore)

  • Khung Keong Yeo

    (National Heart Centre Singapore, Singapore
    Duke-NUS Medical School, Singapore)

  • Kok Joon Chong

    (Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore)

  • Eric Yin Hao Khoo

    (Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
    Division of Endocrinology, University Medicine Cluster, National University Hospital, Singapore)

  • Yin Bun Cheung

    (Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore
    Tampere Center for Child Health Research, University of Tampere and Tampere University Hospital, Finland)

Abstract

Background. Existing methods to link preference-based and profile-based health-related quality of life (HRQoL) questionnaires have their limitations. Hence, we developed a new mapping method (the mean rank method, MRM) and applied it to map the World Health Organization Quality of Life Questionnaire (WHOQOL-BREF) to the EuroQoL 5 Dimensions 5 Levels (EQ-5D-5L). We then compared the new MRM with current methods; i.e., regression-mapped (OLS method) and equipercentile method (EPM). Methods. Singapore residents, aged ≥21 y, were recruited from the general population and 2 outpatient clinics in acute care hospitals. Performance of the MRM was evaluated using both simulation and split-sample validation ( n = 658 in training and n = 657 in validation samples). Using the training sample, we derived 3 sets of mapped EQ-5D-5L utilities based on MRM, OLS method and EPM. Using simulation and the validation sample, we compared the performance of the mapping methods in terms of distribution parameters, mean utility by strata, association with health covariates, and prediction errors at the individual level, among others. Results. The WHOQOL-BREF Physical Health domain is the only domain significantly associated with EQ-5D-5L utilities. Simulation showed that MRM more accurately reproduced the variance and percentiles of the distribution of the observed utilities than did the OLS method or EPM. OLS method tended to underestimate the mean utility of good health states, overestimate the mean utility of poor health states, and underestimate the association with covariates. An analysis of validation sample gave similar results. Conclusion. In scenarios similar to the mapping of WHOQOL-BREF to the EQ-5D-5L, the MRM outperformed the OLS method and EPM in important—though not all—aspects. The simplicity and reproducibility of the MRM makes it an attractive alternative to current methods.

Suggested Citation

  • Hwee Lin Wee & Khung Keong Yeo & Kok Joon Chong & Eric Yin Hao Khoo & Yin Bun Cheung, 2018. "Mean Rank, Equipercentile, and Regression Mapping of World Health Organization Quality of Life Brief (WHOQOL-BREF) to EuroQoL 5 Dimensions 5 Levels (EQ-5D-5L) Utilities," Medical Decision Making, , vol. 38(3), pages 319-333, April.
    • Handle: RePEc:sae:medema:v:38:y:2018:i:3:p:319-333
    DOI: 10.1177/0272989X18756890
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    References listed on IDEAS

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    1. Stavros Petrou & Oliver Rivero-Arias & Helen Dakin & Louise Longworth & Mark Oppe & Robert Froud & Alastair Gray, 2015. "Preferred Reporting Items for Studies Mapping onto Preference-Based Outcome Measures: The MAPS Statement," Medical Decision Making, , vol. 35(6), pages 1-8, August.
    2. Drummond, Michael F. & Sculpher, Mark J. & Claxton, Karl & Stoddart, Greg L. & Torrance, George W., 2015. "Methods for the Economic Evaluation of Health Care Programmes," OUP Catalogue, Oxford University Press, edition 4, number 9780199665884.
    3. Philippe Van Kerm, 2012. "Kernel-smoothed cumulative distribution function estimation with akdensity," Stata Journal, StataCorp LP, vol. 12(3), pages 543-548, September.
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