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In the United States, about 15 million people have asthma. Nearly 5 million of them are children. Asthma is closely linked to allergies. Most, but not all, people with asthma have allergies. Children with a family history of allergy and asthma are more likely to have asthma.
Although asthma affects people of all ages, it often starts in childhood and is more common in children than adults. More boys have asthma than girls, but in adulthood, more women have asthma than men.
Although asthma is a problem among all races, blacks have more asthma attacks and are more likely than whites to be hospitalized for asthma attacks and to die from asthma.
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