Rasch analysis in the development of a simplified version of the National Eye Institute Visual-Function Questionnaire-25 for utility estimation.

Published

Journal Article

PURPOSE: Preference-based health measures value how people feel about the desirability of a health state. Generic measures may not effectively capture the impact of vision loss from ocular diseases. Disease-targeted measures could address this limitation. This study developed a vision-targeted health state classification system based on the National Eye Institute Visual Function Questionnaire-25 (NEI VFQ-25). METHODS: Secondary analysis of NEI VFQ-25 data from studies of patients with central (n = 932)- and peripheral-vision loss (n = 2,451) were used to develop a health state classification system. Classical test theory and Rasch analyses were used to identify a smaller set of NEI VFQ-25 items suitable for the central- and peripheral-vision-loss groups. RESULTS: Rasch analysis of the NEI VFQ-25 items using the peripheral vision-loss data indicated that 11 items fit a unidimensional model, while 14 NEI VFQ-25 items fit using the central-vision-loss data. Combining peripheral-vision-loss data and central-vision-loss data resulted in 9 items fitting a unidimensional model. Six items covering near vision, distance vision, social vision, role difficulties, vision dependency, and vision-related mental health were selected for the health-state classification. CONCLUSIONS: The derived health-state classification system covers relevant domains of vision-related functioning and well-being.

Full Text

Duke Authors

Cited Authors

  • Kowalski, JW; Rentz, AM; Walt, JG; Lloyd, A; Lee, J; Young, TA; Chen, W-H; Bressler, NM; Lee, P; Brazier, JE; Hays, RD; Revicki, DA

Published Date

  • March 2012

Published In

Volume / Issue

  • 21 / 2

Start / End Page

  • 323 - 334

PubMed ID

  • 21814877

Pubmed Central ID

  • 21814877

Electronic International Standard Serial Number (EISSN)

  • 1573-2649

Digital Object Identifier (DOI)

  • 10.1007/s11136-011-9938-z

Language

  • eng

Conference Location

  • Netherlands