Objective
To investigate the psychometric properties of the Brief Fatigue Inventory (BFI) in community-dwelling older adults.
Design
Cross-sectional validation study.
Setting
Community-based longitudinal cohort aging study in Westchester County, New York.
Participants
Subjects (N=302) were non-demented older adults (mean age 76.44 years, 54% female).
Interventions
Not applicable.
Main Outcome Measures
BFI total, severity, and interference summation scores.
Results
A Principle Component Analysis (PCA) yielded two factors: fatigue severity and interference, explaining 65.94% of the variance. Both factors had good reliability, with Cronbach’s α values of 0.867 for fatigue interference and 0.818 for fatigue severity. Higher fatigue scores were associated with older age and worse physical and cognitive functions.
Conclusions
Fatigue is a common and debilitating symptom in the aging population. The current study provides novel findings in validating and establishing a bi-dimensional factor structure for the BFI in older adults. Severity and interference were differentially related to important health outcomes; therefore, utilizing these subscales in addition to the total BFI scaled score is recommended with older adults. Because of its relatively short administration time and established psychometric properties, the BFI can be successfully incorporated into longitudinal studies and clinical trials.