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Recent cessation of smoking and its effect on pregnancy outcomes
Author(s) -
BICKERSTAFF Margaret,
BECKMANN Michael,
GIBBONS Kristen,
FLENADY Vicki
Publication year - 2012
Publication title -
australian and new zealand journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.734
H-Index - 65
eISSN - 1479-828X
pISSN - 0004-8666
DOI - 10.1111/j.1479-828x.2011.01387.x
Subject(s) - medicine , pregnancy , smoking cessation , logistic regression , obstetrics , small for gestational age , retrospective cohort study , multivariate analysis , odds ratio , gestational age , demography , genetics , pathology , sociology , biology
Background: Smoking in pregnancy is associated with a range of adverse pregnancy outcomes.Aim: To compare adverse pregnancy outcomes for women according to smoking status at the first antenatal visit in an Australian setting.Methods: A retrospective study using routinely collected data of all births between 1997 and 2006 at the Mater Mothers’ Hospital Brisbane (MMH). Analysis was undertaken using multivariate logistic regression. The following comparisons were undertaken: (i) smokers versus non‐smokers; (ii) recent quitters (quit within the last 12 months) versus smokers; and (iii) recent quitters versus non‐smokers. Primary outcome measures were small for gestational age (SGA) <10th customised centile and preterm birth (PTB) <37 weeks.Results: Between 1997 and 2006, 40 193 women birthed at the MMH. Of these 30 524 (75.9%), for which adequate data were available, were included in the study. The smoking rate at booking was 15.4%. Compared to non‐smokers ( n = 25 814), women who were smoking at the first visit ( n = 4710) were at increased risk of SGA (aOR = 2.26, 95%CI = 2.08–2.47) and PTB (aOR = 1.42, 95%CI = 1.27–1.59). In the subset (7801 births) used for comparisons two and three, compared to smokers ( n = 1434), recent quitters ( n = 945) were at a decreased risk of SGA (aOR = 0.43, 95%CI = 0.33–0.57) but not PTB (aOR = 0.92. 95%CI = 0.69–1.23). Outcomes for recent quitters and non‐smokers ( n = 5422) appeared similar.Conclusion: This study confirms the increased risk of continued smoking in pregnancy. Women who quit prior to or during early pregnancy appear to have similar risk to that of non‐smokers.