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• W2801381949 abstract "Abstract COPD exacerbations are commonly quantified as rate per year. However, the total amount of time a patient suffers from exacerbations may be stronger related to his or her disease burden than just counting exacerbation episodes. In this study, we examined the relationship between exacerbation frequency and exacerbation-free time, and their associations with baseline characteristics and health-related quality of life. A total of 166 COPD patients reported symptom changes during 12 months. Symptom-defined exacerbation episodes were correlated to the number of exacerbation-free weeks per year. Analysis of covariance was used to examine the effects of baseline characteristics on annual exacerbation frequency and exacerbation-free weeks, Spearman’s rank correlations to examine associations between the two methods to express exacerbations and the Chronic Respiratory Questionnaire (CRQ). The correlation between exacerbation frequency and exacerbation-free weeks was −0.71 ( p < 0.001). However, among frequent exacerbators (i.e., ≥3 exacerbations/year, n = 113) the correlation was weak ( r = −0.25; p < 0.01). Smokers had less exacerbation-free weeks than non-smokers ( β = −5.709, p < 0.05). More exacerbation-free weeks were related to better CRQ Total ( r = 0.22, p < 0.05), Mastery ( r = 0.22, p < 0.05), and Fatigue ( r = 0.23, p < 0.05) scores, whereas no significant associations were found between exacerbation frequency and CRQ scores. In COPD patients with frequent exacerbations, there is substantial variation in exacerbation-free time. Exacerbation-free time may better reflect the burden of exacerbations in patients with COPD than exacerbation frequency does." @default.
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• W2801381949 date "2018-04-03" @default.
• W2801381949 modified "2023-10-18" @default.
• W2801381949 title "'Exacerbation-free time' to assess the impact of exacerbations in patients with chronic obstructive pulmonary disease (COPD): a prospective observational study" @default.
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• W2801381949 doi "https://doi.org/10.1038/s41533-018-0079-5" @default.
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