According to the Centers for Disease Control and Prevention (CDC), asthma is the most common chronic condition affecting children in the United States. In 2009, an estimated 10.2 million U.S. children — almost 10 percent of Americans under 18 years of age — have been diagnosed with asthma.
And it is increasing at an alarming rate; up 75 percent from 1980. A rise in asthma cases among infants and toddlers accounts for a large part of the overall increase. One of the difficulties of diagnosing asthma in this group is that it is difficult to safely measure lung function at that age.
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