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- W2034265233 abstract "Background In the general population, rates of certain respiratory infections (and mortality from these infections) are higher in winter. We hypothesized that in patients with idiopathic pulmonary fibrosis (IPF) and/or pulmonary fibrosis (PF) from any cause, death rates would be increased during the winter season, independent of recognized infection. Our objective was to determine if mortality rates from IPF and/or PF of any cause exhibit seasonal variation. Methods Using death records from the National Center for Health Statistics, we calculated monthly mortality rates for persons with PF and developed a multivariable model to determine if these mortality rates exhibited seasonal variation. Results From spring of 1992 to fall of 2003, there were 27,367,580 deaths in the United States and 170,984 decedents with PF. The average mortality rate among all persons with PF was 17.1% higher in winter (p < 0.0001), 12.7% higher in spring (p < 0.0001), and 5.2% higher in fall (p = 0.0002) than in summer months. These findings persisted when records with a diagnostic code for pneumonia were excluded from the analysis as well as when only records in which PF was the underlying cause of death were included in the analysis. Conclusions Mortality rates from PF exhibit significant seasonal variation, with the highest rates occurring in the winter, even when recognized infection is excluded. Further studies are necessary to determine if this seasonal variation exists in a prospective cohort and, if so, to uncover its etiology. In the general population, rates of certain respiratory infections (and mortality from these infections) are higher in winter. We hypothesized that in patients with idiopathic pulmonary fibrosis (IPF) and/or pulmonary fibrosis (PF) from any cause, death rates would be increased during the winter season, independent of recognized infection. Our objective was to determine if mortality rates from IPF and/or PF of any cause exhibit seasonal variation. Using death records from the National Center for Health Statistics, we calculated monthly mortality rates for persons with PF and developed a multivariable model to determine if these mortality rates exhibited seasonal variation. From spring of 1992 to fall of 2003, there were 27,367,580 deaths in the United States and 170,984 decedents with PF. The average mortality rate among all persons with PF was 17.1% higher in winter (p < 0.0001), 12.7% higher in spring (p < 0.0001), and 5.2% higher in fall (p = 0.0002) than in summer months. These findings persisted when records with a diagnostic code for pneumonia were excluded from the analysis as well as when only records in which PF was the underlying cause of death were included in the analysis. Mortality rates from PF exhibit significant seasonal variation, with the highest rates occurring in the winter, even when recognized infection is excluded. Further studies are necessary to determine if this seasonal variation exists in a prospective cohort and, if so, to uncover its etiology." @default.
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- W2034265233 date "2009-07-01" @default.
- W2034265233 modified "2023-10-15" @default.
- W2034265233 title "Seasonal Variation" @default.
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- W2034265233 doi "https://doi.org/10.1378/chest.08-0703" @default.
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