Trends in prevalence and severity of childhood asthma.

  title={Trends in prevalence and severity of childhood asthma.},
  author={Hugh Ross HR Anderson and Barbara Karen Butland and David P. Strachan},
  volume={308 6944},
OBJECTIVE To test the null hypothesis that there has been no change in the prevalence or severity of childhood asthma over recent years. DESIGN Repeated population prevalence survey with questionnaires completed by parents followed by home interviews with parents. SETTING London borough of Croydon, 1978 and 1991. SUBJECTS All children in one year of state and private primary schools aged 7 1/2 to 8 1/2 years at screening survey. MAIN OUTCOME MEASURES Trends in symptoms, acute severe… CONTINUE READING

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