Refractive Status and Vision Profile: evaluation of psychometric properties and comparison of Rasch and summated Likert-scaling. [Post-print]

dc.contributor.author Garamendi, Estibaliz
dc.contributor.author Pesudovs, Konrad
dc.contributor.author Stevens, Michael J
dc.contributor.author Elliott, David B
dc.date.accessioned 2006-08-24T05:49:51Z
dc.date.available 2006-08-24T05:49:51Z
dc.date.issued 2006-04
dc.description.abstract The psychometric properties of the Refractive Status and Vision Profile (RSVP) questionnaire were evaluated using Rasch analysis. Ninety-one myopic patients from a refractive surgery clinic and general optometric practice completed the RSVP. Rasch analysis of the RSVP ordinal data was performed to examine for unidimensionality and item reduction. The traditional Likert-scoring system was compared with a Rasch-scored RSVP and a reduced item Rasch-scored RSVP. Rasch analysis of the original RSVP showed poor targeting of item difficulty to patient quality of life, items with a ceiling effect and underutilized response categories. Combining the underutilized response scales and removal of redundant and misfitting items improved the internal consistency and targeting of the RSVP, and the reduced 20-item Rasch scored RSVP showed greater relative precision over standard Likert scoring in discriminating between the two subject groups. A Rasch scaled quality of life questionnaire is recommended for use in refractive outcomes research. en
dc.format.extent 193039 bytes
dc.format.mimetype application/pdf
dc.identifier.citation Garamendi E., Pesudovs K., Stevens M J, Elliott DB. 2006. The Refractive Status and Vision Profile: evaluation of psychometric properties and comparison of Rasch and summated Likert-scaling. 'Vision Research'. Vol 46, Nos. 8-9, 1375-83. en
dc.identifier.issn 0042-6989
dc.identifier.uri http://hdl.handle.net/2328/1141
dc.language.iso en
dc.publisher Elsevier en
dc.rights.license In Copyright
dc.subject Myopia en
dc.subject Refractive Errors en
dc.subject Sickness Impact Profile en
dc.subject.other Australian Research Classification 321016 Ophthalmology and Vision Science en
dc.title Refractive Status and Vision Profile: evaluation of psychometric properties and comparison of Rasch and summated Likert-scaling. [Post-print] en
dc.type Preprint en
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