{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:46:43Z","timestamp":1791154003891,"version":"4.1.0"},"reference-count":36,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2013,5,2]],"date-time":"2013-05-02T00:00:00Z","timestamp":1367452800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["BJOG"],"published-print":{"date-parts":[[2013,8]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>To assess the risk for obstetric anal sphincter lacerations in relation to maternal obesity among primiparous women in Sweden.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>A population\u2010based study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>Sweden.<\/jats:p><\/jats:sec><jats:sec><jats:title>Population<\/jats:title><jats:p>All women with vaginal delivery and singleton pregnancy in Sweden in the years 2003\u20132008 (<jats:italic>n<\/jats:italic>\u00a0=\u00a0210\u00a0678).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The Medical Birth Registry, the National Board of Health and Welfare, was used to identify cases of rupture and body mass index (<jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>) classes. The population was categorised into four classes with <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> of &lt;25, 25 to &lt;30, 30 to &lt;35 and &gt;35\u00a0kg\/m<jats:sup>2<\/jats:sup>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main outcome measures<\/jats:title><jats:p>Odds ratios were estimated with 95% confidence intervals. In order to estimate the effect of <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> on obstetric anal sphincter lacerations, with possible confounders accounted for, uni\u2010 and multivariate logistic regressions were performed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In total, 8958 (4.25%) cases of anal sphincter lacerations (grade <jats:styled-content style=\"fixed-case\">III<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">IV<\/jats:styled-content>) occurred; increasing <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> showed a significant near\u2010dose\u2013response type of protective effect against grade <jats:styled-content style=\"fixed-case\">III<\/jats:styled-content>\u2013<jats:styled-content style=\"fixed-case\">IV<\/jats:styled-content> lacerations when compared with women with <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>\u00a0&lt;25\u00a0kg\/m<jats:sup>2<\/jats:sup>: <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> 25 to &lt;30\u00a0kg\/m<jats:sup>2<\/jats:sup>, 0.89; <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> 30 to &lt;35\u00a0kg\/m<jats:sup>2<\/jats:sup>, 0.84; <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>\u00a0&gt;\u00a035\u00a0kg\/m<jats:sup>2<\/jats:sup>, 0.70.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Overweight and obesity were associated with a decreased risk for obstetric anal sphincter lacerations.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.12228","type":"journal-article","created":{"date-parts":[[2013,5,2]],"date-time":"2013-05-02T21:08:57Z","timestamp":1367528937000},"page":"1110-1115","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Risk of obstetric anal sphincter 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