The Multiple Sclerosis Fatigue Self-Efficacy Scale (MS-FSE): initial validation

Journal article

Thomas, S., Kersten, P. and Thomas, P. 2014. The Multiple Sclerosis Fatigue Self-Efficacy Scale (MS-FSE): initial validation. Clinical Rehabilitation. 29 (4), pp. 376-387. https://doi.org/10.1177/0269215514543702
AuthorsThomas, S., Kersten, P. and Thomas, P.
Abstract

Objective:
To examine the validity and sensitivity to change of the Multiple Sclerosis-Fatigue Self-Efficacy scale.

Design:
A validation study nested within a randomized controlled trial.

Setting:
Community setting.

Participants:
Adults with a clinically definite diagnosis of multiple sclerosis and significant fatigue taking part in a randomized controlled trial evaluating a group-based fatigue management programme (FACETS) for people with multiple sclerosis (N=164).

Main measures:
The 9-item Multiple Sclerosis-Fatigue Self-Efficacy scale was completed at baseline, 1-, 4- and 12 months post intervention. Validity, internal consistency and sensitivity to change were examined using classical test theory and Rasch analysis.

Results:
Item 3 was unanswered by 6% of respondents as they did not know any other people with multiple sclerosis; remaining analyses were carried out with this item deleted. All response choices were utilised, no floor or ceiling effects were evident and there were few missing responses. Cronbach’s alphas were high (baseline, 0.89; follow-up 1, 0.93; follow-up 2, 0.94; follow-up 3, 0.90). The Multiple Sclerosis-Fatigue Self-Efficacy scale (8-item) demonstrated good sensitivity to change following attendance of the FACETS programme (within participant effect sizes 0.66 and 0.69 and 0.54 at 1, 4, and 12 months follow-up). Principal Components Analysis yielded one component. In the Rasch analysis two items with disordered thresholds were rescored. Item 8 displayed differential item functioning by disability and was combined into a testlet with item 4, resulting in a unidimensional scale. The sample was well targeted to the scale.

Conclusion:
At a scale level the Multiple Sclerosis-Fatigue Self-Efficacy scale is internally valid and has good sensitivity to change.

KeywordsSelf-efficacy; Fatigue; Scale; Validation; Rasch analysis
Year2014
JournalClinical Rehabilitation
Journal citation29 (4), pp. 376-387
PublisherSAGE
ISSN0269-2155
1477-0873
Digital Object Identifier (DOI)https://doi.org/10.1177/0269215514543702
Official URLhttps://journals.sagepub.com/doi/10.1177/0269215514543702
Publication dates
Online26 Aug 2014
Print01 Apr 2015
Publication process dates
Deposited28 Jul 2022
Publisher's version
License
Output statusPublished
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