Examining the validity of the Multiple-Sclerosis Walking Scale-12 with Rasch analysis: Results from an Italian study

Publication date: Available online 19 September 2019Source: Multiple Sclerosis and Related DisordersAuthor(s): D Marengo, R Rosato, G Gamberini, P Cavalla, M Gironi, F Patti, L Prosperini, C SolaroAbstractBackgroundThe Multiple Sclerosis Walking Scale (MSWS-12) has showed good psychometric properties in reports exploring its validity using Classical Test Theory methods. Findings from recent studies using Item Response Theory methods advance the idea that some aspects of the MSWS-12 does not fully comply with some requirements of sound measurement.Research questionThe present study investigated whether the measurement properties of the Italian version of the MSWS-12 met the assumptions of the Rasch model.MethodsSample consisted of 199 patients with a diagnosis of MS (50% female; Mean age (SD) = 48.15 (12.33)). Analyses were performed using both unidimensional and multidimensional Rasch modeling techniques.ResultsRating scale for items assessing need for support when walking, and ability to run, showed significant functioning problems. A revision of the rating scale improved the measurement properties of these items. Items assessing need for support showed signs of multidimensionality and differential item functioning when controlling for patients’ disease course and EDSS score. Additionally, included items did not appear to cover the full range of impairment as observed in the sample.SignificanceEmerging findings are consistent with those from previous studies in highlig...
Source: Multiple Sclerosis and Related Disorders - Category: Neurology Source Type: research