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Maugeri Respiratory Failure questionnaire reduced form: a method for improving the questionnaire using the Rasch
G Vidotto1, M Carone, P W Jones
1Department General Psychology, University of Padua, Padua, Italy. giulio.vidotto@unipd.it
Disability and Rehabilitation
|July 7, 2007
Summary
The Maugeri Respiratory Failure questionnaire (MRF-28) was refined using Rasch analysis, resulting in the MRF-26. This improved measure accurately assesses health-related quality of life in chronic respiratory failure patients.
Area of Science:
- Medical research
- Psychometrics
- Health outcomes
Background:
- The Maugeri Respiratory Failure questionnaire (MRF-28) was the first instrument developed for chronic respiratory failure (CRF) patients.
- Initial item selection for the MRF-28 utilized classical test theory.
Purpose of the Study:
- To refine the MRF-28 questionnaire using item response theory, specifically Rasch model analysis.
- To enhance the psychometric properties and unidimensionality of the health status measure for CRF patients.
Main Methods:
- Three hundred and seventeen CRF patients completed the MRF-28 self-report questionnaire.
- Data were analyzed using 1-parameter logistic models (Rasch analysis) via RUMM software.
Main Results:
- The initial MRF-28 showed good discriminant power (Person Separation Index = 0.896) but poor item-trait interaction.
- Removing two items improved the Person Separation Index to 0.899 and item-trait interaction.
- Excluding 21 outlier patients resulted in normal residual distribution and confirmed unidimensionality of the refined MRF-26.
Conclusions:
- Classical psychometric tests combined with Rasch analysis yielded the MRF-26.
- The MRF-26 is a moderately sized, unidimensional measure with interval scaling properties.
- The refined questionnaire effectively captures a wide range of CRF effects on quality of life.
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