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- W1858674175 abstract "Publisher SummaryThis chapter provides an overview of the epidemiology of asthma and chronic obstructive pulmonary disease (COPD). Epidemiology studies have used questionnaires to assess for the presence of disease, but are limited by recall and misclassification bias. Incidence rates for asthma and COPD vary depending on the age of the population under consideration. For example, asthma is commonly diagnosed in early childhood and COPD is commonly diagnosed after age 60. Although data indicates that asthma incidence has been increasing, minimal information has been available for trends in COPD incidence. Ninety percent of all childhood asthma is diagnosed before the age of 6 years. Since there is a crude inverse relationship between respiratory symptoms and level of lung function, it is not surprising that as lung function increases in childhood respiratory symptoms decrease and often disappear. Both asthma and COPD are defined as syndromes, and the definitions are loose; thus it is not surprising that there is substantial overlap between the conditions at any given age. Indeed, there are no substantive data to suggest that individuals cannot have both reversible and fixed airflow obstruction, and hence asthma and COPD at the same time. Increased health service utilization has occurred for asthma and COPD during the last two decades. Overall, hospital admissions and discharges have increased for both diseases." @default.
- W1858674175 created "2016-06-24" @default.
- W1858674175 creator A5051093934 @default.
- W1858674175 creator A5073763243 @default.
- W1858674175 date "2009-01-01" @default.
- W1858674175 modified "2023-09-22" @default.
- W1858674175 title "Epidemiology" @default.
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