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Value Health. 2008 Dec;11(7):1162-9. doi: 10.1111/j.1524-4733.2008.00356.x. Epub 2008 May 16.

Validity of the EuroQoL (EQ-5D) instrument in a Greek general population.

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1
Hellenic Open University, Faculty of Social Sciences, Patras, Greece. nkontodi@otenet.gr

Abstract

OBJECTIVES:

The main purpose of this study was to assess the construct validity of the Greek EQ-5D instrument in measuring health-related quality of life, as well as to address the issues of concurrent validity, internal consistency reliability, and sensitivity.

METHODS:

A stratified, representative sample (n = 1388) of the Greek general population was approached for interview (response rate 72.4%). The survey included the EQ-5D, the SF-36, and questions on sociodemographic and clinical characteristics of the sample.

RESULTS:

The EQ-5D dimensions, the EQ visual analog scale, and the UK-based utility index were capable of distinguishing between groups of respondents, in the expected manner, on the basis of sex, age, education, socioeconomic status, self-reported health problems, and health services utilization, thus providing evidence of construct validity. Convergent and divergent validity of the EQ-5D descriptive system were supported by expected relationships with SF-36 scale and summary scores. Additionally, reporting a problem in a given EQ dimension was generally associated with lower SF-36 scores, supporting concurrent validity. Internal consistency reliability and sensitivity were also satisfactorily demonstrated.

CONCLUSIONS:

The results provide initial support for the construct validity of the EQ-5D in Greece, and, in conjunction to future studies addressing test-retest reliability and responsiveness, they support administering the instrument in health status studies, which in turn can contribute to transnational comparisons.

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