Journal of Preventive Medicine and Public Health

Original Articles

Factors Associated With Post-term Birth and Its Relationship to Neonatal Mortality in Japan: An Analysis of National Data From 2017 to 2022: Tasuku Okui, Naoki Nakashima; J Prev Med Public Health. 2024;57(6):564-571. Published online September 24, 2024; DOI: https://doi.org/10.3961/jpmph.24.355

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Abstract Summary PDF Supplementary Material

Objectives
Prior research has not yet examined the relationship between post-term birth and neonatal mortality in Japan, along with factors associated with post-term birth. We investigated these associations utilizing nationwide birth data from Japan.
Methods
Birth and mortality data were obtained from the Vital Statistics of Japan for the years 2017 to 2022. The post-term birth rate was calculated by birth characteristics, and the neonatal mortality rates for post-term and term births were computed. Additionally, log-binomial regression analysis was employed to explore the associations between post-term birth and neonatal mortality, as well as between various characteristics and post-term birth. The characteristics considered included infant sex, maternal age group, parity, maternal nationality, maternal marital status, and household occupation.
Results
This study analyzed data from 4 698 905 singleton infants born at 37 weeks of gestational age or later. Regression analysis revealed that post-term birth was positively associated with neonatal mortality. The adjusted risk ratio for neonatal mortality in post-term compared to term births was 8.07 (95% confidence interval, 5.06 to 12.86). Factors positively associated with post-term birth included female infant sex, older maternal age, primiparity, non-Japanese maternal nationality, unmarried status, and various household occupations, including farmer, full-time worker at a smaller company, other type of worker, and unemployed. Younger maternal age was inversely associated with post-term birth.
Conclusions
In Japan, post-term birth represents a risk factor for neonatal mortality. Additionally, socio-demographic characteristics, such as maternal marital status, nationality, and parity were found to be predictors of post-term birth.

Summary

Key Message
This study investigated the relationship between post-term birth and neonatal mortality in Japan, along with factors associated with post-term birth. Regression analysis revealed that post-term birth was significantly and positively associated with neonatal mortality. Additionally, socio-demographic characteristics, such as older maternal age, primiparity, non-Japanese maternal nationality, and unmarried status were found to be predictors of post-term birth.

Citations

Citations to this article as recorded by

NEONATAL OUTCOMES IN WOMEN WITH POST-TERM PREGNANCIES PRESENTING AT A TERTIARY CARE HOSPITAL
Rukhsana Karim, Zainab Asad
Khyber Journal of Medical Sciences.2026;[Epub] CrossRef

Maternal Exposure to Environmental Tobacco Smoke (ETS) and Pregnancy Outcome (low birth weight or preterm baby) in Prospective Cohort Study.: Bo Eun Lee, Yun Chul Hong, Hye Sook Park, Jong Tae Lee, Jeong Youn Kim, Young Joo Kim, Sang Hyun Kim, Kang Jung Goo, Joo Oh Kim, Eun Hee Ha; Korean J Prev Med. 2003;36(2):117-124.

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Abstract PDF: OBJECTIVES
This study was performed to examine the relationship between maternal exposure to environmental tobacco smoke (ETS) and pregnancy outcomes (low birth weight or preterm baby) in a prospective cohort study. METHODS: We made a pregnant women's cohort, and followed the pregnancy outcomes, between May 1st 2001 and August 31st 2002. We surveyed 2, 250 women who visited our hospital during their 35th gestational week, with a self-administered questionnaire. The final total of mother-infant pairs analyzed in this study was 1, 712. We used a multiple logistic regression analysis to analyze the effect of maternal ETS on the incidence of preterm or low birth weight, and a linear regression analysis for the birth weight and gestational age. RESULTS: Higher exposure to ETS (> or =1 hours/day) during pregnancy was more negatively associated with the gestational age and birth weight, than no exposure to ETS (no or less than 1hour). Maternal exposure to ETS was associated with preterm baby (adjusted odds ratio (AOR) 1.7; 95% confidence interval (CI) 0.9, 3.3) and low birth weight (AOR 2.3; 95% CI 0.9, 5.5). In addition, we found that maternal ETS may reduce the birth weight by 70g after adjusting for potential confounding factors. CONCLUSIONS: This study suggests that maternal exposure to ETS during pregnancy may increase the frequency of low birth weights and preterm births.; Summary

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