{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T23:40:18Z","timestamp":1784158818043,"version":"3.55.0"},"reference-count":33,"publisher":"Korean Society for Preventive Medicine","issue":"6","license":[{"start":{"date-parts":[[2024,9,24]],"date-time":"2024-09-24T00:00:00Z","timestamp":1727136000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"JSPS KAKENHI","award":["JP22K17372"],"award-info":[{"award-number":["JP22K17372"]}]}],"content-domain":{"domain":["jpmph.org"],"crossmark-restriction":true},"short-container-title":["JPMPH"],"published-print":{"date-parts":[[2024,11,30]]},"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3961\/jpmph.24.355","type":"journal-article","created":{"date-parts":[[2024,10,18]],"date-time":"2024-10-18T01:28:13Z","timestamp":1729214893000},"page":"564-571","update-policy":"https:\/\/doi.org\/10.3961\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Factors Associated With Post-term Birth and Its Relationship to Neonatal Mortality in Japan: An Analysis of National Data From 2017 to 2022"],"prefix":"10.3961","volume":"57","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5098-8502","authenticated-orcid":true,"given":"Tasuku","family":"Okui","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4926-8772","authenticated-orcid":true,"given":"Naoki","family":"Nakashima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2350","reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1093\/humrep\/17.10.2762"},{"key":"ref2","volume-title":""},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1067\/mob.2003.446"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2015-3334"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1093\/ajcn\/nqac127"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dys043"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.3109\/00016349709024606"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1136\/bmjopen-2012-001152"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1016\/s0002-9378(98)70482-x"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1136\/archdischild-2015-308553"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1186\/s12912-016-0170-6"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kws244"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.1016\/s0029-7844(97)00049-5"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2009.02.034"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.3109\/00016349.2010.500009"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-018-36290-7"},{"key":"ref17","first-page":"1","volume-title":"Pregnancy 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