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Pregnancy planning, smoking behaviour during pregnancy, and neonatal outcome: UK millennium cohort study

Flower, A, Shawe, JA, Stephenson, J and Doyle, P (2013) Pregnancy planning, smoking behaviour during pregnancy, and neonatal outcome: UK millennium cohort study BMC Pregnancy and Childbirth, 13, 238.

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Abstract

Background Pre-pregnancy health and care are important for the health of the future generations. Smoking during pregnancy has been well-researched and there is clear evidence of harm. But there has been little research on the health impact of planning for pregnancy. This study aims to investigate the independent effects of pregnancy planning and smoking during pregnancy on neonatal outcome. Methods This analysis made use of data from the UK Millennium Cohort Study. The study sample consisted of 18,178 singleton babies born in UK between 2000 and 2001. The neonatal outcomes of interest were low birthweight (<2.5 Kg) and pre-term birth (<37 completed weeks gestation). Logistic regression was used to estimate the association between pregnancy planning and/or smoking and neonatal outcome. Adjusted odds ratios were used to calculate population attributable risk fractions (PAFs). Results 43% of mothers did not plan their pregnancy and 34% were smoking just before and/or during pregnancy. Planners were half as likely to be smokers just before pregnancy, and more likely to give up or reduce the amount smoked if smokers. Unplanned pregnancies had 24% increased odds of low birth weight and prematurity compared to planned pregnancies (AORLBW1.24, 95% CI 1.04-1.48; AORPREM1.24, 95% CI 1.05-1.45), independent of smoking status. The odds of low birth weight for babies of mothers who were smoking just before pregnancy was 91% higher than that of mothers who were not (AORLBW1.91, 95% CI 1.56-2.34). Women who quit or reduced the amount smoked during pregnancy lowered the risk of a low birth weight baby by one third (AORLBW0.66, 95% CI 0.51-0.85) compared with women whose smoking level did not change. Smaller effects were found for prematurity. If all women planned their pregnancy and did not smoke before or during pregnancy, 30% of low birthweight and 14% of prematurity could, in theory, be avoided. Conclusions Planning a pregnancy and avoiding smoking during pregnancy has clear, independent, health benefits for babies. Quitting or reducing the amount smoked during pregnancy can reduce the risk of low birthweight.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Health Sciences
Authors :
AuthorsEmailORCID
Flower, AUNSPECIFIEDUNSPECIFIED
Shawe, JAUNSPECIFIEDUNSPECIFIED
Stephenson, JUNSPECIFIEDUNSPECIFIED
Doyle, PUNSPECIFIEDUNSPECIFIED
Date : 19 December 2013
Identification Number : 10.1186/1471-2393-13-238
Uncontrolled Keywords : Pregnancy planning, Smoking, Low birthweight, Prematurity
Related URLs :
Additional Information : © 2013 Flower et al.; licensee BioMed Central Ltd.
Depositing User : Symplectic Elements
Date Deposited : 18 Nov 2014 13:45
Last Modified : 14 Feb 2015 02:33
URI: http://epubs.surrey.ac.uk/id/eprint/806389

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