© 2004 BMJ Publishing Group Ltd & British Thoracic Society
EDITORIAL
Prevalence of asthma
Asthma prevalence in adults: good news?
1 Department of Epidemiology, University of Ulm, Ulm, Germany
2 Centre for Public Health Research, Research School of Public Health, Massey University Wellington Campus, New Zealand
Correspondence to:
Correspondence to:
Prof Dr med S K Weiland MSc
Department of Epidemiology, University of Ulm, Helmholzstr. 22, 89081Ulm, Germany; stephan.weiland@medizin.uni-ulm.de
Time trends in asthma prevalence may have levelled off
Keywords: asthma; prevalence
| The first 150 words of the full text of this article appear below. |
Few diseases have a relation to age which is as fascinating and complex as for asthma. It is a chronic but not necessarily lifelong condition. The incidence of asthma and wheezing illness peaks in very early childhood, but new incident cases occur throughout life.14 In many affected subjects, particularly children, it disappears after some time.24 However, in a substantial proportion of cases which have apparently lost the disease it will come back, often after many years.3,4 Another intriguing feature is that the sex ratio changes with age. Most studies show that boys are affected more often by wheezing illnesses than girls, but this sex ratio usually reverses during or shortly after puberty, partly due to a higher incidence in females.59
Most studies investigating the relationship between age and asthma have been performed in infants and children and, in fact, different age related phenotypes in childhood have been
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