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Observations on asthma.

A review of the present understanding of asthma leads to the following conclusions: an elevated IgE is the principal risk factor in the development of childhood asthma; secondary exposure to a wide range of environmental agents (including indoor bioallergens) accounts for the variations in prevalence; prevalence (defined by a positive answer to the question "Have you ever had doctor-diagnosed asthma?") ranges between 4 and 8% in children. Black children have a slightly higher prevalence than white children in the United States, and in both races boys have a higher prevalence than girls. A high