{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T15:52:07Z","timestamp":1787500327844,"version":"build-2736575974"},"reference-count":29,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2019,10,31]],"date-time":"2019-10-31T00:00:00Z","timestamp":1572480000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006120","name":"Ministry of the Environment","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006120","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Birth"],"published-print":{"date-parts":[[2020,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>The work patterns of pregnant women may be related to adverse obstetric and perinatal outcomes. This study aimed to clarify the effects of weekly working time according to frequencies of night shifts during pregnancy on adverse outcomes in Japan.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The Japan Environment and Children's Study, a prospective cohort study, was conducted in 15 regions nationwide in Japan. The study population included pregnant women with singleton pregnancies (n\u00a0=\u00a099\u00a0744). The mothers\u2019 working hours and frequencies of night shifts during the first and the second\/third trimesters were assessed using a self\u2010administered questionnaire. Outcome data were collected from medical transcripts.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Compared with nonworking women, women who worked during pregnancy had significantly increased adjusted odds ratios (aORs) of threatened miscarriage (maximum aOR: 1.47, 95% confidence interval [95% CI]: 1.26\u20101.73) and of threatened preterm labor (maximum aOR: 1.63, 95% CI: 1.41\u20101.87). Increased aORs were observed for hypertensive disorders of pregnancy (maximum aOR: 2.02, 95% CI: 1.39\u20102.93) in women working \u226536\u00a0hours per week with night shifts, for vacuum\/forceps delivery (maximum aOR: 1.34, 95% CI: 1.22\u20101.48) at \u226536\u00a0hours with or without night shifts, and for small\u2010for\u2010gestational\u2010age babies (aOR: 1.32, 95% CI: 1.10\u20101.59) at \u226546\u00a0hours with night shifts. In contrast, lower aORs were observed for gestational diabetes and meconium\u2010stained amniotic fluid in women working without night shifts.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Work during pregnancy slightly increased the risks of threatened miscarriage and threatened preterm labor. Long working hours increased the risks of hypertensive disorders of pregnancy, vacuum\/forceps delivery, and small\u2010for\u2010gestational\u2010age babies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/birt.12463","type":"journal-article","created":{"date-parts":[[2019,10,31]],"date-time":"2019-10-31T03:28:29Z","timestamp":1572492509000},"page":"67-79","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Effects of long working hours and shift work during pregnancy on obstetric and perinatal outcomes: A large prospective cohort study\u2014Japan Environment and Children\u2019s Study"],"prefix":"10.1111","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9003-1289","authenticated-orcid":false,"given":"Nobuhiro","family":"Suzumori","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3342-1058","authenticated-orcid":false,"given":"Takeshi","family":"Ebara","sequence":"additional","affiliation":[{"name":"Department of Occupational and Environmental Health Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taro","family":"Matsuki","sequence":"additional","affiliation":[{"name":"Department of Occupational and Environmental Health Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasuyuki","family":"Yamada","sequence":"additional","affiliation":[{"name":"Department of Occupational and Environmental Health Graduate School of Medical Sciences Nagoya City University Nagoya Japan"},{"name":"Graduate School of Health and Sports Science Juntendo University Chiba Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sayaka","family":"Kato","sequence":"additional","affiliation":[{"name":"Department of Occupational and Environmental Health Graduate School of Medical Sciences Nagoya City University Nagoya Japan"},{"name":"Department of Pediatrics and Neonatology Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toyonori","family":"Omori","sequence":"additional","affiliation":[{"name":"Department of Health Care Policy and Management Graduate School of Medical Sciences Nagoya City University Nagoya Japan"},{"name":"National Center for Child Health and Development Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6911-3351","authenticated-orcid":false,"given":"Shinji","family":"Saitoh","sequence":"additional","affiliation":[{"name":"Department of Pediatrics and Neonatology Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0670-8790","authenticated-orcid":false,"given":"Michihiro","family":"Kamijima","sequence":"additional","affiliation":[{"name":"Department of Occupational and Environmental Health Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2265-377X","authenticated-orcid":false,"given":"Mayumi","family":"Sugiura\u2010Ogasawara","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Graduate School of Medical Sciences Nagoya City University Nagoya Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"the Japan Environment & Children\u2019s Study Group","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,10,31]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0029-7844(99)00598-0"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.2105\/AJPH.2008.138412"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.7861\/clinmedicine.13-1-75"},{"key":"e_1_2_6_5_1","unstructured":"The Organisation for Economic Co\u2010operation and Development (OECD).OECD data.https:\/\/data.oecd.org\/emp\/hours-worked.htm. 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