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Quality of Life Research

, Volume 21, Issue 6, pp 1065–1073 | Cite as

Comparing the psychometric properties of the EQ-5D-3L and EQ-5D-5L in cancer patients in Korea

  • Seon Ha Kim
  • Hwa Jung Kim
  • Sang-il Lee
  • Min-Woo Jo
Article

Abstract

Purpose

This study was conducted to assess the redistribution properties of the EQ-5D-3L when using the EQ-5D-5L and to compare the validity, informativity, and reliability of both EQ-5D-3L and EQ-5D-5L in Korean cancer patients.

Methods

Patients visiting one ambulatory cancer center self-administered the two versions of the EQ-5D and the EORTC QLQ-C30 questionnaire. Redistribution properties in each dimension of EQ-5D were analyzed between EQ-5D-3L and EQ-5D-5L. Informativity was evaluated using the Shannon entropy and ceiling effect. Convergent validity was evaluated by comparing the EQ-VAS, ECOG performance status, and EORTC QLQ-C30 subscales. Reliability was also evaluated in terms of test–retest reliability.

Results

All levels of the EQ-5D-3L substantially partitioned into associated levels of the EQ-5D-5L. The average inconsistency rate of the two versions was 3.5%. Absolute informativity was higher for the EQ-5D-5L than for the EQ-5D-3L, but their informative efficiency tended to be similar. The proportion of ‘perfect health’ (11111) decreased from 16.8% in the EQ-5D-3L to 9.7% in the EQ-5D-5L. EQ-5D-5L demonstrated similar or higher correlations with the EQ-VAS, ECOG performance status, and EORTC QLQ-C30, than the EQ-5D-3L. The intraclass correlation coefficient of the EQ-5D-5L index was 0.77.

Conclusions

The EQ-5D-5L had greater informativity and lower rate in the ceiling effect than those values of the EQ-5D-3L. The EQ-5D-5L showed good construct validity and reasonable reliability. Therefore, considering these findings, the EQ-5D-5L may be preferable to the EQ-5D-3L.

Keywords

EQ-5D Health-related quality of life Cancer Psychometrics 

Abbreviations

ECOG

Eastern Cancer Oncology Group

EQ-5D-3L

3-level version of EQ-5D

EQ-5D-5L

5-level version of EQ-5D

EORTC QLQ-C30

European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire Core 30

EU ISPOR

European Union International Society for Pharmacoeconomics and Outcomes Research

HRQoL

Health-related quality of life

HUI2

Health utility index mark 2

HUI3

Health utility index mark 3

ICC

Intraclass correlation coefficient

SF-6D

Short form 6 dimension

VAS

Visual analogue scale

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Seon Ha Kim
    • 1
  • Hwa Jung Kim
    • 2
  • Sang-il Lee
    • 1
  • Min-Woo Jo
    • 1
  1. 1.Department of Preventive MedicineUniversity of Ulsan College of MedicineSeoulKorea
  2. 2.Department of Clinical Epidemiology and BiostatisticsAsan Medical CenterSeoulKorea

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