Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort

Lerdal, Anners; Kottorp, Anders

doi:10.1016/j.ijnurstu.2011.02.019

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort
Authors:	Lerdal, Anners Kottorp, Anders
DOI:	10.1016/j.ijnurstu.2011.02.019
Published in:	International Journal of Nursing Studies
Volume(Issue):	48
Issue:	10
Page(s):	1258
Pages to:	1265
Issue Date:	Oct-2011
Publisher / Ed. Institution:	Elsevier
ISSN:	0020-7489 1873-491X
Language:	English
Subjects:	Cohort study; Middle aged; Fatigue; Psychometrics; Severity of Illness Index
Subject (DDC):	616.8: Neurology, diseases of nervous system
Abstract:	Background: The psychometric properties of the Fatigue Severity Scale (FSS) have not been tested in people with stroke, despite its being the most frequently used instrument measuring fatigue in this population. Objective: The objective of our study was to assess the psychometric properties of the FSS using both traditional and modern test theory approaches in people with stroke. Design and setting: A total of 119 patients admitted to two hospitals in Norway with their first stroke were recruited to a longitudinal study of poststroke fatigue. Data on socio-demographics, fatigue and other clinical variables were collected by face-to-face interviews using standardized questionnaires or by mailed questionnaires at four time points six months apart. A total of 428 responses on the FSS were analysed. The internal scale validity, person response validity, unidimensionality, and uniform differential item functioning were assessed by applications of a Rasch model and by Cronbach's alpha. Additionally, concurrent validity was assessed using bivariate correlation analysis. Results: Items #1 and #2 in the original FSS demonstrated unacceptable high mean-square values. When these two items were removed, the psychometric properties in FSS-7 demonstrated better evidence of validity. No systematic differential item functioning of the items in FSS-7 was found in relation to any of the analysed variables. Conclusion: In patients with stroke, the FSS-7 showed better psychometric properties and had better potential to detect changes in fatigue over time than the FSS-9 version, suggesting satisfactory grounds for removal of items #1 and #2 for its application.
URI:	https://digitalcollection.zhaw.ch/handle/11475/8722
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., & Kottorp, A. (2011). Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort. International Journal of Nursing Studies, 48(10), 1258–1265. https://doi.org/10.1016/j.ijnurstu.2011.02.019

Lerdal, A. and Kottorp, A. (2011) ‘Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort’, International Journal of Nursing Studies, 48(10), pp. 1258–1265. Available at: https://doi.org/10.1016/j.ijnurstu.2011.02.019.

A. Lerdal and A. Kottorp, “Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort,” International Journal of Nursing Studies, vol. 48, no. 10, pp. 1258–1265, Oct. 2011, doi: 10.1016/j.ijnurstu.2011.02.019.

LERDAL, Anners und Anders KOTTORP, 2011. Psychometric properties of the Fatigue Severity Scale : Rasch analyses of individual responses in a Norwegian stroke cohort. International Journal of Nursing Studies. Oktober 2011. Bd. 48, Nr. 10, S. 1258–1265. DOI 10.1016/j.ijnurstu.2011.02.019

Lerdal, Anners, and Anders Kottorp. 2011. “Psychometric Properties of the Fatigue Severity Scale : Rasch Analyses of Individual Responses in a Norwegian Stroke Cohort.” International Journal of Nursing Studies 48 (10): 1258–65. https://doi.org/10.1016/j.ijnurstu.2011.02.019.

Lerdal, Anners, and Anders Kottorp. “Psychometric Properties of the Fatigue Severity Scale : Rasch Analyses of Individual Responses in a Norwegian Stroke Cohort.” International Journal of Nursing Studies, vol. 48, no. 10, Oct. 2011, pp. 1258–65, https://doi.org/10.1016/j.ijnurstu.2011.02.019.