ArticleBMC medical research methodology2011
Re-evaluating a vision-related quality of life questionnaire with item response theory (IRT) and differential item functioning (DIF) analyses.
Article in BMC medical research methodology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Trial
- Stepped care for depression and anxiety in visually impaired older adults: multicentre randomised controlled trial.BMJ (Clinical research ed.) · 2015Trial
- Quality of life and participation after corneal transplantation and potential predictors: A multicenter prospective cohort study.Acta ophthalmologica · 2026Article
- The multiple mediating effects of vision-specific factors and depression on the association between visual impairment severity and fatigue: a path analysis study.BMC psychiatry · 2024Article
- Development and Validation of the Life for Low Vision Questionnaire (LIFE4LVQ) Using Rasch Analysis: A Questionnaire Evaluating Ability and Independence.Journal of clinical medicine · 2023Article
- Calibration of the Dutch EyeQ to Measure Vision Related Quality of Life in Patients With Exudative Retinal Diseases.Translational vision science & technology · 2022Article
- The functional burden of diabetic retinopathy in the United States.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2021Article
- Psychometric validation techniques applied to the IND-VFQ-33 visual function questionnaire: the Hyderabad ocular morbidity in the elderly study (HOMES).BMC medical research methodology · 2021Article
- Age-Related Macular Degeneration and Visual and Physical Disability in a Nationally Representative Sample from the United States.Translational vision science & technology · 2020Article
- 'Dual Sensory Loss Protocol' for Communication and Wellbeing of Older Adults With Vision and Hearing Impairment - A Randomized Controlled Trial.Frontiers in psychology · 2020Article
- Identifying Unbiased Items for Screening Preschoolers for Disruptive Behavior Problems.Journal of pediatric psychology · 2017Article
- Patient-Centered Outcome Measures to Assess Functioning in Randomized Controlled Trials of Low-Vision Rehabilitation: A Review.The patient · 2017Review
- Watchful waiting for subthreshold depression and anxiety in visually impaired older adults.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2015Article
- Dual sensory loss: development of a dual sensory loss protocol and design of a randomized controlled trial.BMC geriatrics · 2013Article
- Selecting optimal screening items for delirium: an application of item response theory.BMC medical research methodology · 2013Article
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4 authors.
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Abstract
backgroundFor the Low Vision Quality Of Life questionnaire (LVQOL) it is unknown whether the psychometric properties are satisfactory when an item response theory (IRT) perspective is considered. This study evaluates some essential psychometric properties of the LVQOL questionnaire in an IRT model, and investigates differential item functioning (DIF).
methodsCross-sectional data were used from an observational study among visually-impaired patients (n = 296). Calibration was performed for every dimension of the LVQOL in the graded response model. Item goodness-of-fit was assessed with the S-X(2)-test. DIF was assessed on relevant background variables (i.e. age, gender, visual acuity, eye condition, rehabilitation type and administration type) with likelihood-ratio tests for DIF. The magnitude of DIF was interpreted by assessing the largest difference in expected scores between subgroups. Measurement precision was assessed by presenting test information curves; reliability with the index of subject separation.
resultsAll items of the LVQOL dimensions fitted the model. There was significant DIF on several items. For two items the maximum difference between expected scores exceeded one point, and DIF was found on multiple relevant background variables. Item 1 'Vision in general' from the "Adjustment" dimension and item 24 'Using tools' from the "Reading and fine work" dimension were removed. Test information was highest for the "Reading and fine work" dimension. Indices for subject separation ranged from 0.83 to 0.94.
conclusionsThe items of the LVQOL showed satisfactory item fit to the graded response model; however, two items were removed because of DIF. The adapted LVQOL with 21 items is DIF-free and therefore seems highly appropriate for use in heterogeneous populations of visually impaired patients.
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