Influence of Maternal Active and Secondhand Smoking during Pregnancy on Childhood Obesity at 3 Years of Age: A Nested Case–Control Study from the Japan Environment and Children’s Study (JECS)

Sayaka Horiuchi, Ryoji Shinohara, Sanae Otawa, Megumi Kushima, Yuka Akiyama, Tadao Ooka, Reiji Kojima, Hiroshi Yokomichi, Kunio Miyake, Hiroyuki Hirai, Koichi Hashimoto, Michio Shimabukuro, Zentaro Yamagata and Japan Environment and Children’s Study Group
Additional contact information
Sayaka Horiuchi: Center for Birth Cohort Studies, University of Yamanashi, Yamanashi 409-3898, Japan
Ryoji Shinohara: Center for Birth Cohort Studies, University of Yamanashi, Yamanashi 409-3898, Japan
Sanae Otawa: Center for Birth Cohort Studies, University of Yamanashi, Yamanashi 409-3898, Japan
Megumi Kushima: Center for Birth Cohort Studies, University of Yamanashi, Yamanashi 409-3898, Japan
Yuka Akiyama: Department of Health Sciences, School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
Tadao Ooka: Department of Health Sciences, School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
Reiji Kojima: Department of Health Sciences, School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
Hiroshi Yokomichi: Department of Health Sciences, School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
Kunio Miyake: Department of Health Sciences, School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
Hiroyuki Hirai: Department of Diabetes, Endocrinology, and Metabolism, Fukushima Medical University, Fukushima 960-1295, Japan
Koichi Hashimoto: Fukushima Regional Centre for the Japan Environmental and Children’s Study, Fukushima 960-1295, Japan
Michio Shimabukuro: Department of Diabetes, Endocrinology, and Metabolism, Fukushima Medical University, Fukushima 960-1295, Japan
Zentaro Yamagata: Center for Birth Cohort Studies, University of Yamanashi, Yamanashi 409-3898, Japan
Japan Environment and Children’s Study Group: Membership of the Japan Environment and Children’s Study Group is provided in Acknowledgments.

IJERPH, 2021, vol. 18, issue 23, 1-13

Abstract: Maternal smoking during pregnancy is a risk factor for childhood obesity; however, the combined effect of secondhand smoking during pregnancy on children in the early years is unclear. We examined the effects of maternal active and secondhand smoking during pregnancy on childhood obesity in a large population-based cohort. A nested case–control study originating from the Japan Environment and Children’s Study was performed. The maternal smoking status was collected via self-administered questionnaires during mid/late pregnancy. Obesity in children was determined based on BMI measured at 3 years of age. In total, 4875 cases and 19,491 controls were included in the analyses. Conditional logistic regression models with a significance level of 5% (two-tailed test) were used to test the association. The proportion of mothers who continued smoking and who were exposed to secondhand smoking daily during pregnancy were 3.9% and 13.0% in cases and 2.9% and 10.8% in controls, respectively. Continuous maternal smoking was associated with increased odds of obesity compared to those who never smoked or quit smoking before the pregnancy (adjusted odds ratio, 1.39; 95% confidence interval, 1.01–1.92). The odds increased further when combined with secondhand smoking. The promotion of non-smoking among family members, in public and workplace could benefit pregnant women and offspring.

Keywords: tobacco smoking; maternal exposure; secondhand smoking; childhood obesity (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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