Journal
JOURNAL OF PAIN AND SYMPTOM MANAGEMENT
Volume 37, Issue 3, Pages 341-351Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jpainsymman.2008.03.015
Keywords
Breast cancer; fatigue; methodology; measurement; response shift; quality of life; symptoms
Funding
- National Cancer Institute [CA82822]
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Fatigue is a common consequence of Cancer chemotherapy and radiotherapy. Invesigation of the impact of cancer treatment on fatigue is compromised by a potential response shift in fatigue ratings, involving recalibration of a respondents internal standard used to judge their current fatigue experience. Using a prospective, longitudinal research design repeated assessments of most and average fatigue were obtained from women (n = 102) with early stage breast cancer receiving adjuvant chemotherapy and/or radiotherapy. Thentest ratings of fatigue were also obtained and used to index the presence of a response shift in fatigue ratings. Results suggested a clinically significant response shift ill ratings of most and average fatigue of approximately one-half standard deviation. Multiple regression analyses suggested large response shifts were associated with higher ratings, receipt of chemotherapy, and lower fatigue catastrophizing. Most importantly, consideration of the observed response shift in fatigue ratings significantly altered the conclusions drawn regarding the magnitude and persistence of fatigue during and after adjuvant therapy for breast cncer.J Pain Symptom Manage 2009;37:341-351. (C) 2009 U.S. Cancer Pain Relief Committee. Published by Elsevier Inc. All rights reserved.
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