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Systematic review and meta\u2010analysis investigating breast feeding and childhood wheezing illness. <jats:italic>Paediatric and Perinatal Epidemiology<\/jats:italic> 2011; <jats:bold>25:<\/jats:bold> 507\u2013518.<\/jats:p><jats:p>There is conflicting evidence concerning the relationship between breast feeding and wheezing illness. The objective of this study was to investigate whether there is any association between breast feeding and wheezing in children aged over 5 years and to discover possible sources of heterogeneity. An electronic search of MEDLINE and EMBASE databases was conducted from January 2000 to June 2010. In addition, reference lists from relevant publications were searched. Birth cohort, cross\u2010sectional and case\u2013control studies were included if they measured any breast feeding or exclusive breast feeding for 3 or 4 months. Wheezing illness, including asthma, was identified based on symptoms, reported diagnosis or objective criteria. Thirty\u2010one publications were identified for meta\u2010analysis. There was no association found between any or exclusive breast feeding and wheezing illness, although there was a high level of heterogeneity between the studies. Subgroup analysis revealed that any breast feeding slightly lowers the odds of wheeze (pooled odds ratio 0.92 [0.86, 0.98]) but slightly increases the odds of asthma defined by specific criteria (pooled odds ratio 1.10 [1.00, 1.22]). This meta\u2010analysis does not provide evidence that breast feeding is protective against wheezing illness in children aged 5 years and over. The difference in the effects of breast feeding according to the nature of the wheezing illness highlights the importance of the heterogeneity of illness phenotypes.<\/jats:p>","DOI":"10.1111\/j.1365-3016.2011.01233.x","type":"journal-article","created":{"date-parts":[[2011,9,1]],"date-time":"2011-09-01T01:56:11Z","timestamp":1314842171000},"page":"507-518","source":"Crossref","is-referenced-by-count":58,"title":["Systematic review and meta\u2010analysis investigating breast feeding and childhood wheezing illness"],"prefix":"10.1111","volume":"25","author":[{"given":"Bronwyn K.","family":"Brew","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. 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