Abstract
Chronic obstructive pulmonary disease (COPD) is a common, preventable and treatable chronic airway disease characterized by persistent airflow restriction and associated respiratory symptoms. COPD is the main cause of morbidity and mortality of chronic diseases and one of the top three causes of death in the world. The prevalence of COPD among provinces in China are at a high levels for years. The prevalence of COPD varies from country to country, region to region, and population to population, and the incidence and development of COPD are influenced by multi risk factors, including individual genetic factors, age, sex, body mass index, abdominal obesity and physical activity and environment factors, such as smoking, indoor and outdoor air pollution, and occupational exposure.
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