{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T07:53:08Z","timestamp":1740124388879,"version":"3.37.3"},"reference-count":21,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2017,5,16]],"date-time":"2017-05-16T00:00:00Z","timestamp":1494892800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100000024","name":"Canadian Institutes of Health Research","doi-asserted-by":"publisher","award":["MT\u201015223","MTC\u201065630"],"award-info":[{"award-number":["MT\u201015223","MTC\u201065630"]}],"id":[{"id":"10.13039\/501100000024","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001804","name":"Canada Research Chairs","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001804","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[2017,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>While evidence suggests that beginning an external cephalic version (<jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content>) before term (34<jats:sup>0\/7<\/jats:sup> to 36<jats:sup>6\/7<\/jats:sup> weeks) compared with after term may be associated with an increase in late preterm birth (34<jats:sup>0\/7<\/jats:sup> to 36<jats:sup>6\/7<\/jats:sup> weeks), it remains unknown what might account for this risk. The objective of the present study is to further investigate the association between <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> before term and late preterm birth.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>Secondary analysis of data collected from the international, multicenter Early <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> trials. We evaluated the relation between <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> exposure and late preterm birth (34<jats:sup>0\/7<\/jats:sup> to 36<jats:sup>6\/7<\/jats:sup> weeks), as well as whether additional risk factors for preterm birth (such as maternal age, height, body mass index, parity, placental location, and perinatal mortality rate) moderated this relation. Generalized linear mixed methods were used to account for center effect and adjust for covariates.<\/jats:p><\/jats:sec><jats:sec><jats:title>Result<\/jats:title><jats:p>Among 1765 women with breech pregnancies and without a prior preterm birth, 749 (42.4%) received at least one <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> before term. Exposure to an <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> before term was not associated significantly independently with odds of preterm birth. However, placenta location moderated the association between early <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> exposure and late preterm birth. The odds of preterm birth in women who were exposed to an <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> before term and who also had an anterior placenta were doubled (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content> 2.05; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.12\u20133.71; <jats:italic>p<\/jats:italic> = 0.02).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In a large cohort of women without known risks for preterm birth, those with an anterior placenta who undergo an <jats:styled-content style=\"fixed-case\">ECV<\/jats:styled-content> before term constitute a subgroup at particular risk for late preterm birth.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.13153","type":"journal-article","created":{"date-parts":[[2017,4,17]],"date-time":"2017-04-17T19:52:42Z","timestamp":1492458762000},"page":"998-1005","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Association of external cephalic version before term with late preterm birth"],"prefix":"10.1111","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2360-9540","authenticated-orcid":false,"given":"Kristie L.","family":"Poole","sequence":"first","affiliation":[{"name":"Department of Clinical Epidemiology and Biostatistics McMaster University Hamilton ON Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah D.","family":"McDonald","sequence":"additional","affiliation":[{"name":"Department of Clinical Epidemiology and Biostatistics McMaster University Hamilton ON Canada"},{"name":"Department of Obstetrics and Gynecology McMaster University Hamilton ON Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lauren E.","family":"Griffith","sequence":"additional","affiliation":[{"name":"Department of Clinical Epidemiology and Biostatistics McMaster University Hamilton ON Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eileen K.","family":"Hutton","sequence":"additional","affiliation":[{"name":"Department of Clinical Epidemiology and Biostatistics McMaster University Hamilton ON Canada"},{"name":"Department of Obstetrics and Gynecology McMaster University Hamilton ON Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"name":"the Early ECV Pilot and ECV2 Trial Collaborative Group","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,5,16]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1067\/mob.2003.442"},{"issue":"7","key":"e_1_2_9_3_1","first-page":"CD000084","article-title":"External cephalic version for breech presentation before term","author":"Hutton EK","year":"2015","journal-title":"Cochrane Database Syst Rev."},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12519-011-0290-8"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpeds.2007.05.002"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2010.02837.x"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1701-2163(16)35337-3"},{"key":"e_1_2_9_8_1","unstructured":"World Health Organization.Neonatal and Perinatal Mortality.2006."},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2288-14-20"},{"key":"e_1_2_9_10_1","first-page":"1","volume-title":"Generalized Linear Mixed Models. 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