*Corrected, details after Acknowledgements.
Caesarean sections and risk of wheezing in childhood and adolescence: data from two birth cohort studies in Brazil†
Article first published online: 14 SEP 2010
© 2010 Blackwell Publishing Ltd
Clinical & Experimental Allergy
Volume 41, Issue 2, pages 218–223, February 2011
How to Cite
Menezes, A. M. B., Hallal, P. C., Matijasevich, A. M., Barros, A. J. D., Horta, B. L., Araujo, C. L. P., Gigante, D. P., Santos, I. S., Minten, G., Domingues, M. R., Dumith, S. C. and Barros, F. C. (2011), Caesarean sections and risk of wheezing in childhood and adolescence: data from two birth cohort studies in Brazil. Clinical & Experimental Allergy, 41: 218–223. doi: 10.1111/j.1365-2222.2010.03611.x
Re-use of this article is permitted in accordance with the Terms and Conditions set out at http://wileyonlinelibrary.com/onlineopen#OnlineOpen_Terms.
- Issue published online: 13 JAN 2011
- Article first published online: 14 SEP 2010
- Submitted 24 January 2010; revised 29 June 2010; accepted 26 July 2010
- caesarean section;
- cohort studies;
- current wheezing;
- developing countries;
- persistent wheezing
Cite this as: A. M. B. Menezes,P. C. Hallal, A. M. Matijasevich,A. J. D. Barros, B. L. Horta, C. L. P. Araujo,D. P. Gigante, I. S. Santos, G. Minten,M. R. Domingues, S. C. Dumith and F. C. Barros, Clinical & Experimental Allergy, 2011 (41) 218–223.
Background There is evidence from two meta-analyses that children born through caesarean section (C-section) may have an increased risk of developing asthma compared with those born through vaginal delivery.
Objective To evaluate the association between mode of delivery and wheezing (current and persistent) in childhood and adolescence, in two birth cohort studies in Brazil.
Methods The outcome variable was based on the International Study of Allergy and Asthma questionnaire, which collects information about wheezing within the 12 months before the interview. Persistent wheezing was defined when it was present in more than one follow-up at different ages, in the 1993 cohort. The questions were asked to mothers when children were aged 4 years (1993 and 2004 cohorts) and directly to cohort participants at 11 and 15 years (1993 cohort). Mode of delivery was collected by the research team of each cohort when children were born.
Results Response rates in the last follow-up visit of the 1993 and 2004 cohorts were 85% and 92%, respectively. The prevalence of current wheezing increased from 20% to 28% at 4 years from 1993 to 2004; at 11 and 15 years, the prevalence was around 14% and 12%, in the 1993 cohort. The proportion of C-sections increased from 30.5% to 45% between 1993 and 2004. In each cohort, the prevalence of current wheezing was similar among children born through vaginal and C-section. The risk for persistent wheezing in the 1993 cohort was higher among girls born through C-section than boys.
Conclusion Despite the increase in the proportion of C-section in two cohorts in Southern Brazil, we found no evidence of an association between mode of delivery and the subsequent risk of wheezing. Among girls, although there was no statistical significance, the risk was higher for those born by C-section, especially regarding persistent wheezing.