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Examining the validity of the multiple-sclerosis walking scale-12 with Rasch analysis: Results from an Italian study
D Marengo1, R Rosato1, G Gamberini2
1Department of Psychology, University of Turin, Via Verdi 10, Turin 10126, Italy.
Multiple Sclerosis and Related Disorders
|September 27, 2019
Summary
The Italian Multiple Sclerosis Walking Scale (MSWS-12) requires revision. Some items assessing walking ability and support needs showed measurement issues, indicating a need for content updates to better capture the full disability spectrum.
Area of Science:
- Rehabilitation science
- Clinical psychometrics
- Neurology
Background:
- The Multiple Sclerosis Walking Scale (MSWS-12) is widely used but recent Item Response Theory studies suggest measurement inconsistencies.
- Classical Test Theory methods previously supported its validity, but newer analyses indicate potential limitations.
Purpose of the Study:
- To evaluate the psychometric properties of the Italian version of the MSWS-12 using Rasch modeling.
- To determine if the MSWS-12 meets the assumptions of the Rasch model for sound measurement in an Italian Multiple Sclerosis (MS) population.
Main Methods:
- Rasch modeling techniques, including unidimensional and multidimensional analyses, were applied.
- The study sample comprised 199 patients diagnosed with Multiple Sclerosis (MS).
Main Results:
- Specific items related to the need for walking support and running ability exhibited significant measurement problems.
- A revised rating scale improved item performance, but issues with multidimensionality and differential item functioning persisted for support-related items.
- The scale did not adequately cover the full range of walking impairment observed in the patient sample.
Conclusions:
- Findings confirm the need to revise the content of the MSWS-12, aligning with previous research.
- Inclusion of new items is recommended to better assess individuals with milder walking impairments at the lower end of the disability spectrum.
