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Epidemiological studies suggest that asthma is still
underdiagnosed in children and young adults. On p 651 Siersted et al report on a population based study among Danish adolescents in which
they examined potential risk factors for underdiagnosed asthma. Asthma
was defined independently of the physician's diagnosis as coexisting
asthma-like symptoms and one or more positive test results of
obstructive airway lability. Undiagnosed asthma comprised about one
third of all cases of asthma identified, and two thirds were in girls.
Underdiagnosis was associated with conditions that may complicate the
diagnostic process, including being overweight and low physical
activity, family problems, passive smoking, and the absence of allergic
rhinitis.