Familial factors confound the association between maternal smoking during pregnancy and young adult offspring overweight.

Abstract:

BACKGROUND:Smoking during pregnancy has been shown to increase the risks of several adverse birth outcomes. Associations with overweight and/or obesity in the offspring have also been suggested. We aim to investigate whether familial factors confound the association between maternal smoking during pregnancy and overweight in early adulthood in young Swedish males born 1983-88. METHODS:In a population-based Swedish cohort comprising 124 203 singleton males born to Nordic mothers between 1983 and 1988, we examined the association between maternal smoking during pregnancy and the risk of overweight in the offspring at age ∼18 years. We also investigated the association within siblings, controlling for common genes and shared environment. RESULTS:In the cohort analyses, the risk of overweight was increased in sons of smoking mothers compared with sons of non-smokers: adjusted odds ratios 1.41, 95% confidence interval (CI) 1.34-1.49, and 1.56, 95% CI 1.46-1.66, for one to nine cigarettes per day, and >10 cigarettes per day, respectively. Stratifying for maternal smoking habits across two subsequent male pregnancies, there was an increased risk of overweight for the second son only if the mother was smoking in both male pregnancies. The effect of smoking during pregnancy on the offspring's body mass index was not present when the association was evaluated within full and half sibling pairs. CONCLUSION:The association between maternal smoking during pregnancy and offspring's risk of overweight appears to be confounded by familial factors.

journal_name

Int J Epidemiol

authors

Iliadou AN,Koupil I,Villamor E,Altman D,Hultman C,Långström N,Cnattingius S

doi

10.1093/ije/dyq064

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

1193-202

issue

5

eissn

0300-5771

issn

1464-3685

pii

dyq064

journal_volume

39

pub_type

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