Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort

Lerdal, A.; Johansson, S.; Kottorp, Anders; von Koch, L.

doi:10.1177/1352458510370792

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort
Authors:	Lerdal, A. Johansson, S. Kottorp, Anders von Koch, L.
DOI:	10.1177/1352458510370792
Published in:	Multiple Sclerosis Journal
Volume(Issue):	16
Issue:	6
Page(s):	733
Pages to:	741
Issue Date:	Jun-2010
Publisher / Ed. Institution:	Sage
ISSN:	1352-4585 1477-0970
Language:	English
Subjects:	Fatigue; Multiple Sclerosis; Psychometrics; Survey and Questionnaire; Severity of Illness Index
Subject (DDC):	616.8: Neurology, diseases of nervous system
Abstract:	Background: Rigorous testing of the original Fatigue Severity Scale (FSS-9) with modern psychometric methods is warranted. Objective: To determine the psychometric properties of the FSS-9 in multiple sclerosis (MS): internal scale validity; person response validity; unidimensionality; uniform differential item functioning; temporal stability of response patterns; and ability to separate people into distinct groups of fatigue. Methods: Rasch analyses were conducted on data from a Norwegian and a Swedish MS cohort followed for two years. Results: Item estimations in the FSS-9 did not differ between sex or levels of education but between the cohorts with regard to disability, disease course and time for evaluation, however, items 1 and 2 demonstrated unacceptable high outfit mean-square values in both cohorts. In an FSS-7 item version, items 3 and 4 in the Norwegian and 4 in the Swedish cohort demonstrated unacceptable goodness of fit but high separation indexes. In the FSS-7, the first unidimensional factor explained 87.5% (Norwegian cohort) and 86.4% (Swedish cohort) of the total variation. Conclusions: In MS, the FSS-7 demonstrates better psychometric properties than the FSS-9; items 1 and 2 neither empirically nor conceptually fit with the other seven items.
URI:	https://digitalcollection.zhaw.ch/handle/11475/8725
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Health Sciences
Organisational Unit:	Institute of Occupational Therapy (IER)
Appears in collections:	Publikationen Gesundheit

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Lerdal, A., Johansson, S., Kottorp, A., & von Koch, L. (2010). Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort. Multiple Sclerosis Journal, 16(6), 733–741. https://doi.org/10.1177/1352458510370792

Lerdal, A. et al. (2010) ‘Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort’, Multiple Sclerosis Journal, 16(6), pp. 733–741. Available at: https://doi.org/10.1177/1352458510370792.

A. Lerdal, S. Johansson, A. Kottorp, and L. von Koch, “Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort,” Multiple Sclerosis Journal, vol. 16, no. 6, pp. 733–741, Jun. 2010, doi: 10.1177/1352458510370792.

LERDAL, A., S. JOHANSSON, Anders KOTTORP und L. VON KOCH, 2010. Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort. Multiple Sclerosis Journal. Juni 2010. Bd. 16, Nr. 6, S. 733–741. DOI 10.1177/1352458510370792

Lerdal, A., S. Johansson, Anders Kottorp, and L. von Koch. 2010. “Psychometric Properties of the Fatigue Severity Scale : Rasch Analyses of Responses in a Norwegian and a Swedish MS Cohort.” Multiple Sclerosis Journal 16 (6): 733–41. https://doi.org/10.1177/1352458510370792.

Lerdal, A., et al. “Psychometric Properties of the Fatigue Severity Scale : Rasch Analyses of Responses in a Norwegian and a Swedish MS Cohort.” Multiple Sclerosis Journal, vol. 16, no. 6, June 2010, pp. 733–41, https://doi.org/10.1177/1352458510370792.