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Original Article
DOI: 10.1016/j.aller.2020.03.008
Available online 19 May 2020
Perinatal smoking exposure and risk of asthma in the first three years of life: A prospective prebirth cohort study
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K. Tanakaa,b,
Corresponding author
tanaka.keiko.jn@ehime-u.ac.jp

Corresponding author.
, M. Arakawac, Y. Miyakea,b
a Department of Epidemiology and Preventive Medicine, Ehime University Graduate School of Medicine, Ehime, Japan
b Epidemiology and Medical Statistics Unit, Translational Research Center, Ehime University Hospital, Ehime, Japan
c Wellness Research Fields, Faculty of Global and Regional Studies, University of the Ryukyus, Okinawa, Japan
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Tables (3)
Table 1. Distribution of selected characteristics in 1304 parent-child pairs, Kyushu Okinawa Maternal and Child Health Study, Japan.
Table 2. Adjusted ORs and 95% CIs for asthma according to perinatal tobacco smoke exposure, Kyushu Okinawa Maternal and Child Health Study, Japan.
Table 3. Adjusted ORs and 95% CIs for asthma according to maternal SHS exposure during pregnancy among 920 children whose mothers were never smokers, Kyushu Okinawa Maternal and Child Health Study, Japan.
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Abstract
Background

There is limited evidence on the association between prenatal smoking exposure and the risk of asthma in children. The aim of this prebirth cohort study was to investigate the association between prenatal and postnatal tobacco smoke exposure and the risk of asthma in Japanese children.

Methods

Study subjects were 1304 mother–child pairs. Information on the variables under study was obtained using repeated questionnaires that were completed by mothers, first prior to delivery, then shortly after birth and subsequently around 4, 12, 24, and 36 months after delivery. Ever asthma was defined as a maternal report of physician-diagnosed asthma at any time since birth. Current asthma was defined as the use of asthma medication at the time of the sixth survey.

Results

Logistic regression models revealed that maternal active smoking, either before pregnancy or during pregnancy, was not associated with the risk of ever asthma or current asthma. Further, no association was observed between postnatally living with at least one household smoker and the risk of asthma. Among children whose mothers are never smokers, maternal second-hand smoke (SHS) exposure at work and/or at home during pregnancy increased the risk of ever asthma and current asthma in children; adjusted odds ratio (95% confidence intervals) for ever asthma and current asthma were 2.41 (1.13–5.05) and 4.82 (1.68–13.43), respectively.

Conclusions

Our findings suggest that maternal SHS exposure during pregnancy might be associated with an increased risk of ever asthma and current asthma in young children whose mothers have never smoked.

Keywords:
Asthma
Child
Passive smoking
Prospective studies
Second-hand smoke
Abbreviations:
CI
KOMCHS
OR
SHS

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