Abstract | INTRODUCTION:
Fatigue is a disruptive symptom that inhibits normal functional performance of COPD patients in daily activities. The availability of a short, simple, reliable and valid scale would improve assessment of the characteristics and influence of fatigue in COPD. METHODS: At baseline, 2107 COPD patients from the ECLIPSE cohort completed the Functional Assessment of Chronic Illness Therapy Fatigue (FACIT-F) scale. We used well-structured classic method, the principal components analysis (PCA) and Rasch analysis for structurally examining the 13-item FACIT-F. RESULTS: Four items were less able to capture fatigue characteristics in COPD and were deleted. PCA was applied to the remaining 9 items of the modified FACIT-F and resulted in three interpretable dimensions: i) general (5 items); ii) functional ability (2 items); and iii) psychosocial fatigue (2 items). The modified FACIT-F had high internal consistency (Cronbach's α = 0.91) and it did not fit a uni-dimensional Rasch model, confirming the prior output from the PCA. The correlations between total score and each dimension were ≥ 0.64 and within dimensions ≥0.43 (p < 0.001 for all).The original and modified FACIT-F had significant convergent validity; its scores were associated with SGRQ total score (0.69 and 0.7) and mMRC dyspnoea scores (0.48 and 0.47), (p = <0.001 for all). The scale had meaningful discriminating ability in identifying patients with poor exercise performance and more depressive symptoms. CONCLUSION: The original and modified FACIT-F are valid and reliable scales in COPD. The modified version is shorter and measures not only total fatigue but also its sub-components in COPD.
|
Authors | Khaled Al-shair, Hana Muellerova, Janelle Yorke, Stephen I Rennard, Emiel F M Wouters, Nicola A Hanania, Amir Sharafkhaneh, Jørgen Vestbo, ECLIPSE investigators |
Journal | Health and quality of life outcomes
(Health Qual Life Outcomes)
Vol. 10
Pg. 100
(Aug 23 2012)
ISSN: 1477-7525 [Electronic] England |
PMID | 22913289
(Publication Type: Comparative Study, Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
|
Chemical References |
|
Topics |
- Activities of Daily Living
- Adult
- Aged
- Bronchodilator Agents
- Data Interpretation, Statistical
- Fatigue
(diagnosis)
- Female
- Humans
- Male
- Middle Aged
- Multivariate Analysis
- Principal Component Analysis
- Psychometrics
(instrumentation)
- Pulmonary Disease, Chronic Obstructive
(complications, psychology, therapy)
- Quality of Life
(psychology)
- Reproducibility of Results
- Severity of Illness Index
- Smoking
(epidemiology, psychology)
- Surveys and Questionnaires
(standards)
- Vital Capacity
(physiology)
|