A Vision "Bolt-On" Item Could Increase the Discriminatory Power of the EQ-5D Index Score.

Journal Article (Journal Article)

BACKGROUND: Recently, a vision "bolt-on" EuroQol five-dimensional questionnaire (EQ-5D) was developed and tentative utility values (i.e., a "value set") for this new descriptive system were estimated. OBJECTIVES: To compare the discriminatory power of this bolt-on and standard utility-based EQ-5D health indices. METHODS: Cross-sectional data on the (3-level) vision bolt-on EQ-5D were collected through face-to-face interviews with 500 and 336 individuals with and without visual impairment, respectively. To assess the discriminatory power of the vision bolt-on index relative to the standard EQ-5D index developed in the vision bolt-on valuation study, 16 pairs of mutually exclusive subgroups of individuals defined by the individuals' visual acuity and responses to the 14-item visual function questionnaire were compared pairwise. The absolute mean difference in the two index scores and the corresponding F statistic derived from the comparisons were used as measures of discriminatory power. RESULTS: The absolute mean difference in the bolt-on index score was larger than that in the standard EQ-5D index score in 14 of the 16 comparisons. The bolt-on index score exhibited a larger F-statistic value than did the standard EQ-5D index score in all known-group comparisons, with the F-statistic ratio ranging from 0.415 to 0.770. CONCLUSIONS: The vision bolt-on EQ-5D appears to be more discriminative than the standard EQ-5D in measurement of vision problems. Future studies should investigate the extent to which the vision bolt-on item can increase the sensitivity of the EQ-5D to vision change in interventional studies.

Full Text

Duke Authors

Cited Authors

  • Luo, N; Wang, X; Ang, M; Finkelstein, EA; Aung, T; Wong, T-Y; Lamoureux, E

Published Date

  • December 2015

Published In

Volume / Issue

  • 18 / 8

Start / End Page

  • 1037 - 1042

PubMed ID

  • 26686788

Electronic International Standard Serial Number (EISSN)

  • 1524-4733

Digital Object Identifier (DOI)

  • 10.1016/j.jval.2015.08.002


  • eng

Conference Location

  • United States