Patel, Swatee P., Marjo-Riitta, Järvelin and Little, Mark P. (2008) Systematic review of worldwide variations of the prevalence of wheezing symptoms in children. Environmental Health, 7:57. ISSN 1476-069X (doi:10.1186/1476-069X-7-57)

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Abstract

Background: Considerable variation in the prevalence of childhood asthma and its symptoms (wheezing) has been observed in previous studies and there is evidence that the prevalence has been increasing over time.

Methods: We have systematically reviewed the reported prevalence and time trends of wheezing symptoms among children, worldwide and within the same country over time. All studies comprising more than 1000 persons and meeting certain other quality criteria published over a 16-year period, between January 1990 and December 2005, are reported and a comparison of ISAAC (International Study of Asthma and Allergies in Childhood) and non-ISAAC studies is made, in part as a way of expanding the power to examine time trends (the older studies tend to be non-ISAAC), but also to examine possible methodological differences between ISAAC and non-ISAAC questions.

Results: A wide range of current prevalence of wheeze was observed between and within countries over time. The UK had the highest recorded prevalence of 32.2% in children aged 13–14 in 1994–5 and Ethiopia had the lowest prevalence, 1.7% in children aged 10–19 in 1996. All studies in Australia and the UK were compared using multiple logistic regression. ISAAC phase I and III studies reported significantly higher prevalence of current wheeze (OR = 1.638) compared with non-ISAAC studies, after adjusting for various other factors (country, survey year, age of child, parental vs child response to the survey). Australia showed a significantly higher prevalence of current wheezing (OR = 1.343) compared with the UK, there was a significant increase in the prevalence odds ratio per survey year (2.5% per year), a significant decrease per age of child (0.7% per year), and a significantly higher response in current wheezing if the response was self-completed by the child (OR = 1.290). These factors, when explored separately for ISAAC and non-ISAAC studies, showed very different results. In ISAAC studies, or non-ISAAC studies using ISAAC questions, there was a significant decrease in current wheezing prevalence over time (2.5% per year). In non-ISAAC studies, which tend to cover an earlier period, there was a significant increase (2.6% per year) in current wheezing prevalence over time. This is very likely to be a result of prevalence of wheezing increasing from the 1970s up to the early 1990s, but decreasing since then.

Conclusion: The UK has the highest recorded prevalence of wheezing and Ethiopia the lowest. Prevalence of wheezing in Australia and the UK has increased from the 1970s up to the early 1990s, but decreased since then and ISAAC studies report significantly higher prevalences than non-ISAAC studies.

Item Type:	Article
Additional Information:	[1] First published: 10 November 2008. [2] Published as: Environmental Health, (2008), 7:57. [3] Environmental Health is an open access, online only journal. [4] Citation: Patel, Swatee P., Marjo-Riitta, Järvelin and Little, Mark P. (2008) Systematic review of worldwide variations of the prevalence of wheezing symptoms in children. Environmental Health, 7 (57). doi:10.1186/1476-069X-7-57. The electronic version of this article is the complete one and can be found online at: http://www.ehjournal.net/content/7/1/57. [5] Copyright: © 2008 Patel et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords:	variations, prevalence, wheezing symptoms, children, worldwide
Subjects:	R Medicine > RC Internal medicine R Medicine > RJ Pediatrics
Pre-2014 Departments:	School of Health & Social Care > Department of Health Development
Related URLs:	Publisher Organisation
Last Modified:	18 Nov 2016 15:44
URI:	http://gala.gre.ac.uk/id/eprint/2283

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