Re-evaluating a vision-related quality of life questionnaire with item response theory (IRT) and differential item functioning (DIF) analyses

R.M.A. van Nispen; D.L. Knol; M. Langelaan; G.H.M.B. van Rens

doi:10.1186/1471-2288-11-125

Re-evaluating a vision-related quality of life questionnaire with item response theory (IRT) and differential item functioning (DIF) analyses

R.M.A. van Nispen
, D.L. Knol
, M. Langelaan
, G.H.M.B. van Rens

Research output: Contribution to Journal › Article › Academic › peer-review

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Abstract

Background: For 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). Methods. Cross-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

Original language	English
Article number	125
Journal	BMC Medical Research Methodology
Volume	11
DOIs	https://doi.org/10.1186/1471-2288-11-125
Publication status	Published - 2011

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AU - van Rens, G.H.M.B.

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Re-evaluating a vision-related quality of life questionnaire with item response theory (IRT) and differential item functioning (DIF) analyses

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