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Quality of Life Research

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01.11.2011

A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults: an application of a Rasch model

verfasst von: Anners Lerdal, Anders Kottorp, Caryl Gay, Bradley E. Aouizerat, Carmen J. Portillo, Kathryn A. Lee

Erschienen in: Quality of Life Research | Ausgabe 9/2011

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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.

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Titel: A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults: an application of a Rasch model
verfasst von: Anners Lerdal
Anders Kottorp
Caryl Gay
Bradley E. Aouizerat
Carmen J. Portillo
Kathryn A. Lee
Publikationsdatum: 01.11.2011
Verlag: Springer Netherlands
Erschienen in: Quality of Life Research / Ausgabe 9/2011
Print ISSN: 0962-9343
Elektronische ISSN: 1573-2649
DOI: https://doi.org/10.1007/s11136-011-9877-8

Springer Medizin

Abstract

Purpose

Methods

Results

Conclusion

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