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.
Published in : Multiple Sclerosis Journal
Volume(Issue) : 16
Issue : 6
Pages : 733
Pages to: 741
Publisher / Ed. Institution : Sage
Issue Date: Jun-2010
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
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.
Departement: Gesundheit
Organisational Unit: Institute of Occupational Therapy (IER)
Publication type: Article in scientific Journal
DOI : 10.1177/1352458510370792
ISSN: 1352-4585
1477-0970
URI: https://digitalcollection.zhaw.ch/handle/11475/8725
Appears in Collections:Publikationen Gesundheit

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