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Quality of Life Research

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20-09-2018

The 88-item Multiple Sclerosis Spasticity Scale: a Rasch validation of the Italian version and suggestions for refinement of the original scale

Auteurs: Leonardo Pellicciari, Marcella Ottonello, Andrea Giordano, Caterina Albensi, Franco Franchignoni

Gepubliceerd in: Quality of Life Research | Uitgave 1/2019

Abstract

Background

In multiple sclerosis (MS), the impact of spasticity on the patient’s life is a key issue, and it is fundamental that existing tools measuring the patient’s perspective undergo psychometric analysis and refinement to optimize confidence in their use in clinical practice and research.

Objective

We examined—by Rasch analysis (RA)—the main metric characteristics of the 88-item Multiple Sclerosis Spasticity Scale (MSSS-88) to: (i) further validate its Italian version (MSSS-88-IT), previously validated through classical test theory methods only and (ii) independently verify the measurement properties of the original scale.

Methods

MSSS-88 data from a convenience sample of 232 subjects with MS underwent RA, mainly examining item fit, reliability indices, test information function, dimensionality, local item independence, and differential item functioning (DIF).

Results

Most items fitted the Rasch model, but 13/88 items showed a misfit in infit and/or outfit values. Rasch reliability indices were high (> 0.80). Test information functions in most subscales showed a sharp decrease in measurement precision as the ability level departs from the quite limited central range of maximal information. The unidimensionality of each subscale was confirmed. Thirteen item pairs showed local dependency (residual correlations > 0.30) and three items presented DIF.

Conclusion

Reliability, dimensionality and some internal construct validity characteristics of the MSSS-88-IT were confirmed. But, drawbacks of the original MSSS-88 emerged related to some item misfit, redundancy, or malfunctioning. Thus, further large independent studies are recommended, to verify the robustness of previous findings and examine the appropriateness of a few targeted item replacements.

vorige artikel Validation of two PROMIS item banks for measuring social participation in the Dutch general population

volgende artikel Factor structure and measurement invariance of the Subjective Vitality Scale: evidence from Chinese adolescents in Hong Kong

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Titel: The 88-item Multiple Sclerosis Spasticity Scale: a Rasch validation of the Italian version and suggestions for refinement of the original scale
Auteurs: Leonardo Pellicciari
Marcella Ottonello
Andrea Giordano
Caterina Albensi
Franco Franchignoni
Publicatiedatum: 20-09-2018
Uitgeverij: Springer International Publishing
Gepubliceerd in: Quality of Life Research / Uitgave 1/2019
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI: https://doi.org/10.1007/s11136-018-2005-2

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Abstract

Background

Objective

Methods

Results

Conclusion

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