Health and Quality of Life Outcomes

Background: The EQ-5D is a reliable tool for measuring Health-Related Quality of Life (HRQoL). However, concern has been expressed that it may ignore elements of HRQoL, particularly cognition. In response to this concern, the EQ-5D has been extended with a cognitive dimension (EQ-5D+C). The aim of this study was to compare the performance of the EQ-5D and the EQ5D+C in elderly patients with cognitive impairments by assessing their construct validity and responsiveness. Methods: Data from the MEDICIE study (n = 196) were used, in which all questionnaires were rated by proxies. Results: Regarding construct validity, we found similar correlations between the EQ-5D and the Mini Mental State Examination (MMSE) and between the EQ-5D+C and the MMSE. Furthermore, both the EQ-5D and the EQ-5D+C were responsive to changes in the MMSE, with the EQ-5D performing slightly better. Conclusion: We conclude that the EQ-5D performs well for evaluating HRQoL in a population with cognitive impairments. Based on the results of this explorative study, it does not seem necessary to adjust the current classification system by adding a cognitive dimension. However, in order to compare both instruments regarding utility values, it is necessary to develop a new scoring algorithm for the EQ-5D+C by conducting a general population study. Considering the explorative nature of this study, it is recommended that more aspects of the validity of both the EQ-5D and the EQ-5D+C are explored in patients with cognitive impairments using a more tailored study design. Background The increasing number of older adults who are diagnosed with dementia has far-reaching implications for health service delivery and expenditures [1]. Economic evaluations are performed more often to assist decision-makers in setting priorities, especially with regard to resource alloPublished: 14 June 2007 Health and Quality of Life Outcomes 2007, 5:33 doi:10.1186/1477-7525-5-33 Received: 5 January 2007 Accepted: 14 June 2007 This article is available from: http://www.hqlo.com/content/5/1/33 © 2007 Wolfs et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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