The Effect of Maternal Age at the First Childbirth on Gestational Age and Birth Weight: The Japan Environment and Children’s Study (JECS)

Kyozuka, Hyo; Fujimori, Keiya; Hosoya, Mitsuaki; Yasumura, Seiji; Yokoyama, Tadahiko; Satô, Akiko; Hashimoto, Koichi

doi:10.2188/jea.je20170283

Cited by 60 publications

(67 citation statements)

References 25 publications

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“…Therefore, it might be reasonable to assume that systematic inflammation as a significant increase in WBCs in the proinflammatory diet group was related to PTB. However, PTB has the same endpoint, consisting of two clinical subtypes: spontaneous PTB and medically indicated PTB, which is conducted for cases of SGA or HDP (Kyozuka et al, ). Habitual proinflammatory diet has associations with regulation of inflammation, leading to modulation of the atherogenesis process and endothelial dysfunction (Barbaresko, Koch, Schulze, & Nöthlings, ).…”

Section: Discussionmentioning

confidence: 99%

Effect of proinflammatory diet before pregnancy on gestational age and birthweight: The Japan Environment and Children's Study

Ishibashi

Kyozuka

Fujimori

et al. 2019

Maternal & Child Nutrition

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The daily diet plays a role in systematic inflammation and may be one of the causes of preterm birth. We aimed to examine the effect of a daily proinflammatory diet before pregnancy on gestational age and birthweight using a large birth cohort in Japan. We used data of singleton pregnancies in the Japan Environment and Children's Study involving live birth from 2011 to 2014 to calculate the dietary inflammatory index. We used individual meals with 30 food parameters from a semiquantitative food frequency questionnaire, which assessed diet intake before pregnancy. Participants were categorized according to the quartile of dietary inflammatory index. A multiple logistic regression model was used to estimate the risk of a proinflammatory diet on preterm birth (PTB) before 37 or 34 weeks and low birthweight (LBW) less than 2,500 or 1,500 g, accounting for maternal age, body mass index before pregnancy, smoking status, education, and household income. After applying our inclusion criteria, 89,329 participants were eligible for the present study. Multiple regression analysis showed that the proinflammatory diet had an increased risk of PTB < 34 weeks (adjusted odds ratio: 1.29, 95% confidence interval [1.07, 1.55]) and <2,500‐g LBW (adjusted odds ratio: 1.08, 95% confidence interval [1.01, 1.16]) compared with the control. In conclusion, a proinflammatory diet before pregnancy was a risk factor for PTB < 34 weeks and LBW < 2,500 g. Therefore, proinflammatory diet needs to be controlled to improve perinatal prognosis.

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Section: Discussionmentioning

confidence: 99%

Effect of proinflammatory diet before pregnancy on gestational age and birthweight: The Japan Environment and Children's Study

Ishibashi

Kyozuka

Fujimori

et al. 2019

Maternal & Child Nutrition

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“…]30 years based on a previous study that showed that maternal age was related to certain obstetric outcomes, such as PTB, LBW, and SGA. 26 BMI before pregnancy was categorized into three groups (<18.5 kg/m 2 , 18.5-25.0 kg/m 2 , and >25.0 kg/m 2 ). 27,28 Parity was categorized into two groups (nulliparous and multiparous).…”

Section: Obstetric Outcomes and Confounding Factorsmentioning

confidence: 99%

Maternal sleep duration and neonatal birth weight: The Japan Environment and Children’s Study

Murata

Kyozuka

Fukuda

et al. 2020

Preprint

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Objective: To evaluate the effect of maternal sleep duration (MSD) on low birth weight infants (LBW), small for gestational age infants (SGA), and macrosomia. Design: Prospective cohort study Setting: The Japan Environment and Children's Study (JECS) Population: Participants enrolled in JECS, with singleton pregnancies after 22 weeks, who gave birth between 2011 and 2014. Methods: Participants were categorized into five groups according to MSD during pregnancy: G1 (MSD <6.0 h), G2 (6.0-7.9 h), G3 (8.0-8.9 h), G4 (9.0-9.9 h), and G5 (10.0-12.0 h). Main outcome measures: The effect of MSD on the risk of LBW (<2,500 g and <1,500 g), SGA, and macrosomia (>4,000 g) with G2 as the reference, while adjusting for gestational excessive body weight gain (BWG). Analysis was also performed after stratification by gestational BWG. Results: We analyzed 82,171 participants. The adjusted odds ratios (aORs) of LBW <2,500 g in G4 and G5 and of SGA in G4 were 0.90 (95% confidence interval [CI], 0.83-0.99), 0.86 (95% CI, 0.76-0.99), and 0.91 (95% CI, 0.82-0.99), respectively, before adjusting for excessive gestational BWG. No significant association was observed between MSD and these outcomes after adjusting for excessive gestational BWG. Among women with appropriate gestational BWG, the aORs of LBW <2,500 g and SGA in G4 were 0.88 (95% CI, 0.80-0.97) and 0.87 (95% CI, 0.78-0.97), respectively. Conclusion: This study revealed that 9.0-9.9 h of MSD significantly decreased LBW <2,500 g and SGA in pregnant women with appropriate gestational BWG, relative to 6.0-7.9 h of MSD.

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“…]35 years). 22,23 BMI before pregnancy was categorized into three groups (<18.5, 18.5-25.0, and <25.0). Parity was categorized into two groups (nulliparous and multiparous).…”

Section: Obstetric Outcomes and Confounding Factorsmentioning

confidence: 99%

Preterm deliveries affected by mechanical disadvantage in women with uterine myomas: a prospective cohort study from the Japan Environment and Children’s Study

Murata¹,

Kyozuka²,

Endo³

et al. 2020

Preprint

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Objective: To evaluate the incidence of adverse pregnancy outcomes (APOs) in women with uterine myomas and clarify the effect of uterine myomas on pregnancy outcomes. Design: Prospective cohort study Setting: The Japan Environment and Children's Study (between 2011-2014) Population: Women (86,370) with singleton births after 22 weeks of gestation. Methods: Using logistic regression, the adjusted odds ratios (aORs) for APOs were calculated considering women without uterine myomas as the reference. Additionally, we used logistic regression to evaluate the effect of intrauterine infection (II) on the incidence of preterm births (PTB) and preterm premature rupture of membranes (pPROM). Main Outcome Measures: PTB (before 37 and 34 weeks), pPROM, II, and gestational hypertension (GH). Results: In women with uterine myomas, the aORs for PTB

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The Effect of Maternal Age at the First Childbirth on Gestational Age and Birth Weight: The Japan Environment and Children’s Study (JECS)

Cited by 60 publications

References 25 publications

Effect of proinflammatory diet before pregnancy on gestational age and birthweight: The Japan Environment and Children's Study

Effect of proinflammatory diet before pregnancy on gestational age and birthweight: The Japan Environment and Children's Study

Maternal sleep duration and neonatal birth weight: The Japan Environment and Children’s Study

Preterm deliveries affected by mechanical disadvantage in women with uterine myomas: a prospective cohort study from the Japan Environment and Children’s Study

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