|Title:||Psychometric properties of the Fatigue Severity Scale : Rasch analyses of responses in a Norwegian and a Swedish MS cohort|
|Authors :||Lerdal, A.|
von Koch, L.
|Published in :||Multiple Sclerosis Journal|
|Publisher / Ed. Institution :||Sage|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|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.|
|Organisational Unit:||Institute of Occupational Therapy (IER)|
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen Gesundheit|
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