Rasch analysis in the development of a simplified version of the national eye institute visual-function questionnaire-25 for utility estimation

Jonathan W. Kowalski, Anne M. Rentz, John G. Walt, Andrew Lloyd, Jeff Lee, Tracey A. Young, Wen Hung Chen, Neil M. Bressler, Paul Lee, John E. Brazier, Ron D. Hays, Dennis A. Revicki

Research output: Contribution to journalArticle

Abstract

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 visiontargeted 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 peripheralvision 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 peripheralvision-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. Accepted: 19 May 2011/Published online: 4 August 2011

Original languageEnglish (US)
Pages (from-to)323-334
Number of pages12
JournalQuality of Life Research
Volume21
Issue number2
DOIs
StatePublished - Mar 1 2012

Keywords

  • Central vision loss
  • Health preferences and utilities
  • Health-related quality of life
  • Peripheral vision loss
  • Vision-related functioning and well-being

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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    Kowalski, J. W., Rentz, A. M., Walt, J. G., Lloyd, A., Lee, J., Young, T. A., Chen, W. H., Bressler, N. M., Lee, P., Brazier, J. E., Hays, R. D., & Revicki, D. A. (2012). Rasch analysis in the development of a simplified version of the national eye institute visual-function questionnaire-25 for utility estimation. Quality of Life Research, 21(2), 323-334. https://doi.org/10.1007/s11136-011-9938-z