Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-2038
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults : an application of a Rasch model
Authors: Lerdal, Anners
Kottorp, Anders
Gay, Caryl
Aouizerat, Bradley E.
Portillo, Carmen J.
Lee, Kathryn A.
DOI: 10.21256/zhaw-2038
10.1007/s11136-011-9877-8
Published in: Quality of Life Research
Volume(Issue): 20
Issue: 9
Page(s): 1447
Pages to: 1456
Issue Date: 2011
Publisher / Ed. Institution: Springer
ISSN: 0962-9343
1573-2649
Language: English
Subjects: HIV seropositivity; Psychometrics; Quality of life; Severity of Illness Index
Subject (DDC): 616: Internal medicine and diseases
Abstract: Purpose: To examine the psychometric properties of the 9-item Fatigue Severity Scale (FSS) using a Rasch model application. Methods: A convenience sample of HIV-infected adults was recruited, and a subset of the sample was assessed at 6-month intervals for 2 years. Socio-demographic, clinical, and symptom data were collected by self-report questionnaires. CD4 T-cell count and viral load measures were obtained from medical records. The Rasch analysis included 316 participants with 698 valid questionnaires. Results: FSS item 2 did not advanced monotonically, and items 1 and 2 did not show acceptable goodness-of-fit to the Rasch model. A reduced FSS 7-item version demonstrated acceptable goodness-of-fit and explained 61.2% of the total variance in the scale. In the FSS-7 item version, no uniform Differential Item Functioning was found in relation to time of evaluation or to any of the socio-demographic or clinical variables. Conclusion: This study demonstrated that the FSS-7 has better psychometric properties than the FSS-9 in this HIV sample and that responses to the different items are comparable over time and unrelated to socio-demographic and clinical variables.
Further description: Erworben im Rahmen der Schweizer Nationallizenzen (http://www.nationallizenzen.ch)
URI: https://digitalcollection.zhaw.ch/handle/11475/8392
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., Gay, C., Aouizerat, B. E., Portillo, C. J., & Lee, K. A. (2011). A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults : an application of a Rasch model. Quality of Life Research, 20(9), 1447–1456. https://doi.org/10.21256/zhaw-2038
Lerdal, A. et al. (2011) ‘A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults : an application of a Rasch model’, Quality of Life Research, 20(9), pp. 1447–1456. Available at: https://doi.org/10.21256/zhaw-2038.
A. Lerdal, A. Kottorp, C. Gay, B. E. Aouizerat, C. J. Portillo, and K. A. Lee, “A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults : an application of a Rasch model,” Quality of Life Research, vol. 20, no. 9, pp. 1447–1456, 2011, doi: 10.21256/zhaw-2038.
LERDAL, Anners, Anders KOTTORP, Caryl GAY, Bradley E. AOUIZERAT, Carmen J. PORTILLO und Kathryn A. LEE, 2011. A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults : an application of a Rasch model. Quality of Life Research. 2011. Bd. 20, Nr. 9, S. 1447–1456. DOI 10.21256/zhaw-2038
Lerdal, Anners, Anders Kottorp, Caryl Gay, Bradley E. Aouizerat, Carmen J. Portillo, and Kathryn A. Lee. 2011. “A 7-Item Version of the Fatigue Severity Scale Has Better Psychometric Properties among HIV-Infected Adults : An Application of a Rasch Model.” Quality of Life Research 20 (9): 1447–56. https://doi.org/10.21256/zhaw-2038.
Lerdal, Anners, et al. “A 7-Item Version of the Fatigue Severity Scale Has Better Psychometric Properties among HIV-Infected Adults : An Application of a Rasch Model.” Quality of Life Research, vol. 20, no. 9, 2011, pp. 1447–56, https://doi.org/10.21256/zhaw-2038.


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