Preterm birth rates in Japan from 1979 to 2014: Analysis of national vital statistics

Sakata, Soyoko; Konishi, Shoko; Ng, Chris Fook Sheng; Watanabe, Chiho

doi:10.1111/jog.13460

Cited by 32 publications

(34 citation statements)

References 36 publications

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“…20 Potential risk factors related to preterm birth were selected and analysed based on a literature review. [10][11][12][13][14] Variables including gestational age, maternal age, maternal education, maternal ethnicity, immigrant, smoking, drinking, parity, delivery mode, fertility treatment, gestational age at the first prenatal care visit, number of prenatal care visits, gestational hypertension, gestational diabetes, pre-eclampsia or eclampsia, infant sex and date of delivery were included in our analysis.…”

Section: Definition and Measurementsmentioning

confidence: 99%

“…10 Maternal age at delivery could explain the secular trends of preterm birth in Japan from 1979 to 2014 based on national birth data. 11 During the Chilean sociodemographic transition period 1991-2012, the increase in advanced maternal age (35 years or older) was evaluated to significantly increase the risk of preterm birth. 12 Economic inequalities were also found in relation to preterm births in four Brazilian birth cohort studies conducted between 1982 and 2011.…”

Section: Introductionmentioning

confidence: 99%

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Ten-year time trends in preterm birth during a sociodemographic transition period: a retrospective cohort study in Shenzhen, China

Luo

Wang

et al. 2020

BMJ Open

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ObjectivesTo investigate time trends of preterm birth and estimate the contributions of risk factors to the changes in preterm birth rates over a decade (2009–2018) of transitional period in Shenzhen, China.DesignRetrospective cohort study between 2009 and 2018.SettingAll births in Baoan during January 2009 and December 2018 registered in the Shenzhen Birth Registry Database.Participants478 044 live births were included with sociodemographic and medical records for both women and infants.Outcome measuresThe incidence rate of preterm birth stratified by different maternal and infant characteristics. Multiple logistic regression was used to identify significant risk factors associated with preterm birth. The population attributable risk fraction of each factor was calculated to estimate its contribution to variations of preterm birth rate over the 10 years.ResultsA total of 27 829 preterm births from 478 044 (5.8%) live births were recorded and the preterm birth rate increased from 5.5% in 2009 to 6.2% in 2018. Medically induced preterm birth rate increased from 2.0% in 2009 to 3.4% in 2018 while spontaneous preterm labour rate decreased from 3.3% to 2.7% over the decade years. Risk factors including multiple pregnancy (0.28% increase) drove the rise of preterm birth rate, whereas changes in maternal educational attainment (0.22% reduction) and prenatal care utilisation (0.45% reduction) had contributed to the decline in preterm birth rate.ConclusionsAn uptrend of preterm birth rate was observed in an area under rapid sociodemographic transitions during 2009–2018 and the changes were associated with these sociodemographic transitions. Continued investments in girls’ education and prenatal care have the potential of reducing preterm birth rate.

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Section: Definition and Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ten-year time trends in preterm birth during a sociodemographic transition period: a retrospective cohort study in Shenzhen, China

Luo

Wang

et al. 2020

BMJ Open

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“…Lower birth weight comprises both preterm births and SGA. Preterm births in Japan have slightly increased over the past several decades [ 14 ], and some studies suggest that inadequate prepregnant body mass index (BMI) and weight gain during pregnancy is a crucial cause of lower birth weight [ 15 , 16 ]. Thus, to determine whether and to what extent women born at term with SGA had a higher risk of adverse birth outcomes in their own offspring, we investigated the intergenerational effect of birth weight among Japanese women born at term by examining the effect of maternal birth weight on SGA and LBW in their offspring, as well as HDP.…”

Section: Introductionmentioning

confidence: 99%

Association of maternal birth weight with the risk of low birth weight and small-for-gestational-age in offspring: A prospective single-center cohort study

et al. 2021

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Background Although low birth weight in Japan has slightly increased over the past several decades, the association between maternal birth weight and pregnancy outcomes remains poorly understood. Methods In this hospital-based, prospective cohort study conducted at the National Center for Child Health and Development, we obtained information on pregnant women’s birth weight via their maternal and child health handbook. We analyzed 944 women born at term after dividing them into five categories according to their birth weight: <2500 g, 2500–2999 g, 3000–3499 g, 3500–3999 g, and ≥4000 g. Multivariate logistic regression analysis and trend analysis were used to elucidate the extent to which maternal birth weight was associated with small-for-gestational-age and low birth weight in offspring, as well as with hypertensive disorders of pregnancy. Results Compared with women with a birth weight of 3000–3499 g, those born with a birth weight <2500 g had a significantly higher risk of low birth weight (adjusted odds ratio: 5.39, 95% confidence interval: 2.06–14.1) and small-for-gestational-age (adjusted odds ratio: 9.11, 95% confidence interval: 3.14–26.4) infants. No significant association was found between the incidence of hypertensive disorders of pregnancy and preterm birth. A linear relationship was observed between the lower birth weight categories and a higher risk of low birth weight and small-for-gestational-age (p-values for trends: 0.009 and <0.001, respectively), but no linear relationship was observed for the risk of preterm birth and hypertensive disorders of pregnancy (p-value for trends: 0.317 and 0.157, respectively). Conclusions Our findings suggest that lower maternal birth weight is associated with small-for-gestational-age and low birth weight in offspring of women born at term.

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“…In Japan, the preterm birth rate has recently settled at about 5.7%, and shows no sign of decreasing. 2) Prognoses for preterm infants have improved due to advances in neonatal medical care, although preterm birth remains a major cause of perinatal death. 3) The establishment of adequate care for preterm birth is an urgent issue requiring immediate attention.…”

Section: Introductionmentioning

confidence: 99%

Development of new therapeutic agents for preterm birth by glycosaminoglycan chain remodeling of urinary trypsin inhibitor

Tanaka

Kakizaki

Kodama

et al. 2019

Hypertens Res Pregnancy

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This study aimed to examine the effects of the glycosaminoglycan (GAG) chain in urinary trypsin inhibitor (UTI) on uterine cervical fibroblasts (UCFs) and to apply the findings to the development of more effective therapeutic drugs for the management of preterm birth. Methods: We prepared GAG chain-remodeled UTIs by hydrolysis and /or transglycosylation by testicular hyaluronidase. These UTIs were added to UCFs obtained from gynecology operations, and the effects of UTIs on the release of IL-8, IL-6, MMP-8, and MMP-9 were examined. Results: UTIs that were not hydrolyzed tended to reduce IL-8 release more strongly than GAG chain-hydrolyzed UTIs. IL-6 was not affected by GAG chain hydrolysis of UTIs. GAG chain-hydrolyzed UTIs tended to reduce MMP-8 and MMP-9 release more strongly than non-hydrolyzed UTIs. Conclusions: Our findings suggest that the GAG chain of UTI might reduce hyaluronan during cervical ripening by reducing IL-8 release and has opposite effects on reducing MMP-8 and MMP-9 release related to collagen degradation. This insight may be helpful in the development of more effective therapeutic drugs for the management of preterm birth.

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Preterm birth rates in Japan from 1979 to 2014: Analysis of national vital statistics

Abstract: The rates of preterm birth among mothers aged in their 20s and early 30s increased between 1979 and 2014, which contributed to the secular increase in rates of preterm birth at < 37 weeks.

Cited by 32 publications

References 36 publications

Ten-year time trends in preterm birth during a sociodemographic transition period: a retrospective cohort study in Shenzhen, China

Ten-year time trends in preterm birth during a sociodemographic transition period: a retrospective cohort study in Shenzhen, China

Association of maternal birth weight with the risk of low birth weight and small-for-gestational-age in offspring: A prospective single-center cohort study

Development of new therapeutic agents for preterm birth by glycosaminoglycan chain remodeling of urinary trypsin inhibitor

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