Risk Factors for Low Birth Weight Infants in Japan

Babazono, Akira; Tsuda, Toshihide; Yamamoto, Etsuhide; Mino, Yoshio; Babazono, Tsuneko; Kishi, Yoshiki; Sigemi, Jun; Ogawa, Tomoko; Aoyama, Hideyasu

doi:10.2188/jea.4.91

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…These rates largely vary among countries [3,4] and among the birth place of mothers even within the same country [5,6]. In Japan, the rate of low birth weight or preterm birth is known to vary according to the maternal social characteristics [7][8][9]. However, studies on the association between maternal nationalities and adverse birth outcomes are few in Japan.…”

Section: Introductionmentioning

confidence: 99%

Association of maternal nationality with preterm birth and low birth weight rates: analysis of nationwide data in Japan from 2016 to 2020

Okui

Sato

Morokuma

et al. 2023

matern health, neonatol and perinatol

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Background The rate of low birth weight or preterm birth is known to vary according to the birth place of mothers. However, in Japan, studies that investigated the association between maternal nationalities and adverse birth outcomes are few. In this study, we investigated the association between maternal nationalities and adverse birth outcomes. Methods We obtained live birth data from the Vital Statistics 2016–2020 of the Ministry of Health, Labour, and Welfare. We used data on maternal age, sex, parity, gestational age, birth weight, number of fetuses, household occupation, paternal nationality, and maternal nationality for each infant. We compared the rates of preterm birth and low birth weight at term among mothers whose nationalities were Japan, Korea, China, Philippines, Brazil, and other countries. Log binomial regression model was used to investigate the association between maternal nationality and the two birth outcomes using the other infants’ characteristics as covariates. Results In the analysis, data on 4,290,917 singleton births were used. Mothers from Japan, Korea, China, the Philippines, Brazil, and other nations had preterm birth rates of 4.61%, 4.16%, 3.97%, 7.43%, 7.69%, and 5.61%, respectively. The low birth weight rate among Japanese mothers was 5.36% and was the highest among the maternal nationalities. Regression analysis showed that the relative risk for preterm birth among Filipino, Brazilian, and mothers from other countries (1.520, 1.329, and 1.222, respectively) was statistically significantly higher compared with Japanese mothers. In contrast, the relative risk for Korean and Chinese mothers (0.870 and 0.899, respectively) was statistically significantly lower compared with Japanese mothers. Mothers from Korea, China, the Philippines, Brazil, and other nations had a relative risk for low birth weight that was statistically significantly lower than that of Japanese mothers (0.664, 0.447, 0.867, 0.692, and 0.887, respectively). Conclusions Support for mothers from the Philippines, Brazil, and other countries are necessary to prevent preterm birth. A future study is necessary to investigate the differences in characteristics among mothers of different nationalities in order to uncover the reason for the high risk for low birth weight among Japanese mothers.

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Section: Introductionmentioning

confidence: 99%

Association of maternal nationality with preterm birth and low birth weight rates: analysis of nationwide data in Japan from 2016 to 2020

Okui

Sato

Morokuma

et al. 2023

matern health, neonatol and perinatol

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Maternal Active and Passive Smoking and Fetal Growth: A Prospective Study in Nagoya, Japan.

Matsubara

Kida²,

Tamakoshi

et al. 2000

Journal of Epidemiology

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In order to examine the effect of maternal active and passive smoking on fetal growth, we carried out a population-based cohort study. A self-administered questionnaire was distributed to 15,207 women who notified their pregnancy from April, 1989 to March, 1991. A total of 7,411 mother-singleton infant pairs were analyzed in this study. Paternal smoking status and maternal hours exposed to environmental tobacco smoke (ETS) were used as indicators of passive smoking.Infants born to active smoking mothers were 96 g lighter, on an average, at birth than those born to non-smokers, and the relative risk for intrauterine growth retardation was 1.79 (95% confidence interval (CI) = 1.05-3.04) among active smoking mothers.Infants with smoking fathers weighted 11 g lighter, on an average, than those with non-smoking fathers, and mean birth weight of infants was reduced by 19 g among mothers exposed to ETS. The relative risk for intrauterine growth retardation in non-smoking pregnants with a smoking husband and those exposed to ETS was 0.95 (95% Cl = 0.72-1.26) and 0.95 (95% Cl = 0.71-1.26), respectively. Our findings indicated an adverse effect of maternal active smoking on fetal growth in Japanese pregnant population, but with small influence of maternal passive smoking.

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Risk Factors for Low Birth Weight Infants in Japan

Cited by 2 publications

References 20 publications

Association of maternal nationality with preterm birth and low birth weight rates: analysis of nationwide data in Japan from 2016 to 2020

Association of maternal nationality with preterm birth and low birth weight rates: analysis of nationwide data in Japan from 2016 to 2020

Maternal Active and Passive Smoking and Fetal Growth: A Prospective Study in Nagoya, Japan.

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