title: Age-associated differences in fatigue among patients with cancer.
abstract: BACKGROUND
  There has been some suggestion that the fatigue experienced by older cancer patients is more severe than that of younger cohorts; however, there is little empirical evidence to support this claim.
  
  
  OBJECTIVE
  The goal of the present study was to determine the differential impact of age and cancer diagnosis on ratings of fatigue using a validated self-report instrument.
  
  
  METHODS
  The Functional Assessment of Chronic Illness Therapy-Fatigue subscale consists of 13 items measuring fatigue experience and its impact on daily life, with scores ranging from 0 (severe fatigue) to 52 (no fatigue). Fatigue data were available from the U.S. general population (n=1075; 51.3% female, 45.9+/-16.5 years) and a sample of mixed-diagnosis cancer patients (n=738; 64.3% female, 58.7+/-13.6 years). General population participants were recruited using an Internet-based survey panel; patients with cancer were recruited from Chicago-area oncology clinics.
  
  
  RESULTS
  On average, the cancer patient group reported more severe fatigue than the general population group (36.9 vs. 46.6; F[1,1797]=271.95, P<0.001). There was evidence for increased fatigue with age (F[6,719]=2.56, P<0.02) among patients with cancer, but not in the general population (P=0.06). Furthermore, the group x age interaction was not significant (P=0.44). Hemoglobin (Hgb) was treated as a covariate for 430 patients with available data; there was no main effect for age in this analysis.
  
  
  CONCLUSIONS
  Older adults, whether they had a cancer diagnosis, reported more fatigue than younger adults. These differences may be explained, in part, by Hgb level. Future research would be helpful to explore longitudinal changes in fatigue in the general population and guide fatigue management for the older cancer patient.
authors.affiliation: Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA. z-butt@northwestern.edu
authors.forename: Zeeshan
authors.initials: Z
authors.lastname: Butt
authors.forename: Arati V
authors.initials: AV
authors.lastname: Rao
authors.forename: Jin-Shei
authors.initials: JS
authors.lastname: Lai
authors.forename: Amy P
authors.initials: AP
authors.lastname: Abernethy
authors.forename: Sarah K
authors.initials: SK
authors.lastname: Rosenbloom
authors.forename: David
authors.initials: D
authors.lastname: Cella
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D002641:Chicago; D003430:Cross-Sectional Studies; D005221:Fatigue / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications* / Q000503:physiopathology; D011788:Quality of Life; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires