Chronic lower respiratory disease (CLRD) is defined by the Centers for Disease Control and Prevention (CDC) and the World Health Organization as encompassing 4 major diseases: chronic obstructive pulmonary disease (COPD), chronic bronchitis, emphysema, and asthma.
1-3 In the United States, approximately 14.8 million people have been diagnosed with COPD and more than 25 million people have asthma.
4,5 According to the CDC, CLRD has resulted in 47.8 deaths per 100 000 population, making it the fourth leading cause of death in 2019.
6 As a major public health issue, CLRD imposes a considerable burden on individuals, families, and societies. In 2008, the direct cost for health care expenditures related to CLRD was estimated at $53.7 billion and the indirect cost due to lost productivity was estimated at $14.3 billion.
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