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Prospective Study of Maternal Alcohol Intake During Pregnancy or Lactation and Risk of Childhood Asthma: The N orwegian Mother and Child Cohort Study
Author(s) -
Magnus Maria C.,
DeRoo Lisa A.,
Håberg Siri E.,
Magnus Per,
Nafstad Per,
Nystad Wenche,
London Stephanie J.
Publication year - 2014
Publication title -
alcoholism: clinical and experimental research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.267
H-Index - 153
eISSN - 1530-0277
pISSN - 0145-6008
DOI - 10.1111/acer.12348
Subject(s) - medicine , pregnancy , asthma , obstetrics , prospective cohort study , lactation , relative risk , cohort , cohort study , pediatrics , confidence interval , genetics , biology
Background Many women drink during pregnancy and lactation despite recommendations to abstain. In animals, alcohol exposure during pregnancy and lactation influences lung and immune development, plausibly increasing risk of asthma and lower respiratory tract infections ( LRTI s). Studies in humans are few. Methods In the N orwegian Mother and Child Cohort Study, we examined maternal alcohol intake during pregnancy and lactation in relation to risk of current asthma at 36 months (49,138 children), recurrent LRTI s by 36 months (39,791 children), and current asthma at 7 years (13,253 children). Mothers reported frequency and amount of alcohol intake each trimester and the first 3 months following delivery. We calculated adjusted relative risk ( aRR ), comparing children of drinkers to nondrinkers, using Generalized Linear Models. Results A total of 31.8% of mothers consumed alcohol during first trimester, 9.7% during second trimester, and 15.6% during third trimester. Infrequent and low‐dose prenatal alcohol exposure showed a modest statistically significant inverse association with current asthma at 36 months ( aRR s ~ 0.85). No association was seen with the highest alcohol intakes during the first trimester when alcohol consumption was most common. RRs of maternal alcohol intake during pregnancy with recurrent LRTIs were ~1, with sporadic differences in risk for some metrics of intake, but without any consistent pattern. For current asthma at 7 years, similar inverse associations were seen as with current asthma at 36 months but were not statistically significant. Among children breastfed throughout the first 3 months of life, maternal alcohol intake during this time was not significantly associated with any of the 3 outcomes. Conclusions The low levels of alcohol exposure during pregnancy or lactation observed in this cohort were not associated with increased risk of asthma or recurrent LRTI s. The slight inverse associations of infrequent or low‐dose prenatal alcohol exposure with asthma may not be causal.