{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T12:52:13Z","timestamp":1780923133497,"version":"3.54.1"},"reference-count":22,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2020,7,8]],"date-time":"2020-07-08T00:00:00Z","timestamp":1594166400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006636","name":"Forskningsr\u00e5det om H\u00e4lsa, Arbetsliv och V\u00e4lf\u00e4rd","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006636","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004359","name":"Vetenskapsr\u00e5det","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004047","name":"Karolinska Institutet","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004047","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":[[2020,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Some studies have shown that women with a previous cesarean section, compared with women with a previous vaginal delivery, have an increased risk of retained placenta during a subsequent vaginal delivery. It is unknown whether this is mediated by anterior placental location, when the placenta might cover the uterine scar. The aim of this study was to evaluate whether the increased risk of retained placenta in women with a previous cesarean section is mediated by anterior placental location.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>This is a population\u2010based cohort study, with data from the regional population\u2010based Stockholm\u2010Gotland Obstetric Cohort, Sweden, from 2008 to 2014. The overall study population included 49\u00a0598 women with a vaginal second delivery, where adequate information about placental location from the second\u2010trimester ultrasound scan was available. For the main analysis, including the 3921 women with a previous cesarean section, we calculated the relative risk of retained placenta in women with an anterior placental location, using women with non\u2010anterior placental locations as reference. Relative risks were calculated as odds ratios (OR) with 95% CI. In a second model, adjustments were made for maternal age, height, country of birth, smoking in early pregnancy, infant sex, and in vitro fertilization.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In the overall study population, the rate of retained placenta at the second delivery was 2.0%. The proportion of women with a retained placenta was higher among women with a previous cesarean compared with those with a previous vaginal delivery (3.4% vs 1.9%; <jats:italic>P<\/jats:italic>\u00a0&lt;\u00a0.0001). In the main analysis, including women with a previous cesarean section, the risk for retained placenta was not increased with anterior compared with non\u2010anterior placental location (OR 0.84, 95% CI 0.60\u20101.20). Adjustments did not affect the estimates in a significant way.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The increased risk of retained placenta in women with a previous cesarean section is not mediated by anterior placental location.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.13943","type":"journal-article","created":{"date-parts":[[2020,6,23]],"date-time":"2020-06-23T23:10:52Z","timestamp":1592953852000},"page":"1666-1673","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Placental location and risk of retained placenta in women with a previous cesarean section: A population\u2010based cohort study"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2925-3779","authenticated-orcid":false,"given":"Michaela","family":"Granfors","sequence":"first","affiliation":[{"name":"Department of Medicine Solna Clinical Epidemiology Division Karolinska Institutet Stockholm Sweden"},{"name":"Department of Women\u2019s Health Division of Obstetrics Karolinska University Hospital Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2879-4271","authenticated-orcid":false,"given":"Anna","family":"Sandstr\u00f6m","sequence":"additional","affiliation":[{"name":"Department of Medicine Solna Clinical Epidemiology Division Karolinska Institutet Stockholm Sweden"},{"name":"Department of Women\u2019s Health Division of Obstetrics Karolinska University Hospital Stockholm Sweden"},{"name":"Department of Women's and Children's Health Uppsala University Uppsala Sweden"},{"name":"Department of Obstetrics and Gynecology Oregon Health and Science University Portland OR USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1528-4563","authenticated-orcid":false,"given":"Olof","family":"Stephansson","sequence":"additional","affiliation":[{"name":"Department of Medicine Solna Clinical Epidemiology Division Karolinska Institutet Stockholm Sweden"},{"name":"Department of Women\u2019s Health Division of Obstetrics Karolinska University Hospital Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johanna","family":"Belachew","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Uppsala University Uppsala Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ove","family":"Axelsson","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Uppsala University Uppsala Sweden"},{"name":"Center for Clinical Research, S\u00f6rmland Uppsala University Eskilstuna 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