Measuring fatigue in Parkinsons disease: A psychometric study of two brief generic fatigue questionnaires
2006 (English)In: Journal of Pain and Symptom Management, ISSN 0885-3924, E-ISSN 1873-6513, Vol. 32, no 5, 420-432 p.Article in journal (Refereed) Published
This study evaluated and compared the measurement properties of the 13-item Functional Assessment of Chronic Illness Therapy-Fatigue Scale (FACIT-F) and the 9-item Fatigue Severity Scale (FSS) in 118 consecutive Parkinsons disease (PD) patients, using traditional and Rasch measurement methodologies. Both questionnaires exhibited excellent data quality and reliability (coefficient alpha greater than= 0.9), and acceptable rating scale functionality, and both discriminated between fatigued and nonfatigued patients. factor and Rasch analyses provided general support for unidimensionality of both FACIT-F and FSS, although they do not appear to measure identical aspects of fatigue. No signs of differential item functioning (DIF) were found for the FACIT-F, whereas potential age DIF, was detected for two FSS items. These results support the measurement validity of both questionnaires in PD, although the FACIT-F displayed better measurement precision and modest psychometric advantages over the FSS. Availability of psychometrically sound fatigue measures that are applicable across disorders provides a sound basis for advancing the understanding of this common and distressing complaint.
Place, publisher, year, edition, pages
2006. Vol. 32, no 5, 420-432 p.
fatigue; Parkinsons disease; questionnaires; reliability; validity
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-53487DOI: 10.1016/j.jpainsymman.2006.05.021OAI: oai:DiVA.org:liu-53487DiVA: diva2:290027