Related Experiment Videos
Catquest questionnaire: re-validation in an Australian cataract population
Vijaya K Gothwal1, Thomas A Wright, Ecosse L Lamoureux
1NH & MRC Centre for Clinical Eye Research, Department of Ophthalmology, Flinders Medical Centre and Flinders University of South Australia, Bedford Park, Australia.
Clinical & Experimental Ophthalmology
|November 3, 2009
Summary
The Catquest-9SF questionnaire is a reliable tool for assessing visual disability in Australian cataract patients. Rasch analysis confirmed its validity, showing good performance in the local cohort.
Area of Science:
- Ophthalmology
- Health Outcomes Research
- Psychometrics
Background:
- The Catquest questionnaire, developed for European cataract surgery outcomes.
- Validated in Sweden as the Catquest-9SF using Rasch analysis.
- Previous validation used traditional methodology.
Purpose of the Study:
- Assess Catquest and Catquest-9SF performance in Australian patients.
- Utilize Rasch analysis for psychometric evaluation.
- Evaluate measurement properties in a new population.
Main Methods:
- 217 Australian cataract patients self-administered the Catquest.
- Rasch analysis assessed unidimensionality, person separation, and targeting.
- Principal components analysis (PCA) used for unidimensionality.
Main Results:
- Original Catquest required revision due to misfit and multidimensionality.
- Catquest-9SF demonstrated good performance and unidimensionality in Australians.
- Targeting was marginally worse than Swedish data, indicating lower visual disability.
Conclusions:
- The Catquest-9SF is a valid and reliable measure for Australian cataract patients.
- Confirms suitability for assessing visual disability post-cataract surgery.
- Supports its use in clinical and research settings.