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. 1991 May 11;302(6785):1116–1118. doi: 10.1136/bmj.302.6785.1116

Prevalence of asthma in Melbourne schoolchildren: changes over 26 years.

C F Robertson 1, E Heycock 1, J Bishop 1, T Nolan 1, A Olinsky 1, P D Phelan 1
PMCID: PMC1669840  PMID: 2043782

Abstract

OBJECTIVES--To determine the prevalence of asthma in the past 12 months in Melbourne schoolchildren aged 7, 12, and 15 years and to compare the prevalence of a history of asthma with that of 26 years ago. DESIGN--A questionnaire on respiratory symptoms was distributed to children for completion by parents and return to the school. Subjects were selected by a stratified cluster design. SETTING--Government and non-government schools in the greater Melbourne area, Australia. SUBJECTS--10,981 children. Parents completed questionnaires for 3324 children aged 7, 2899 aged 12, and 2968 aged 15. The overall response rate was 90%. MAIN OUTCOME MEASURES--History of wheeze or asthma in the past 12 months and in lifetime. RESULTS--The prevalences of wheeze in the past 12 months were 23.1%, 21.7%, and 18.6% for 7, 12, and 15 year olds respectively. A history of wheeze was more common in boys than in girls at age 7 (443/1711 v 324/1614) and 12 (418/1767 v 322/1718) but not at age 15. Overall, 78% (1548) of those reporting wheeze also reported a history of asthma and 83% (1611) had used a bronchodilator. The prevalence of a history of asthma among 7 year olds was 46% compared with 19.1% in the 1964 survey, an increase of 141%. CONCLUSIONS--The current prevalence of asthma in Melbourne schoolchildren is high and has risen substantially over the past 26 years.

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Selected References

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