{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T22:25:22Z","timestamp":1767824722017,"version":"3.49.0"},"reference-count":24,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2010,12,31]],"date-time":"2010-12-31T00:00:00Z","timestamp":1293753600000},"content-version":"vor","delay-in-days":1552,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[2006,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:italic>Objective.<\/jats:italic> To determine if maternal age (35 years of age or older) in primiparous women is a risk factor for the development of obstetric anal sphincter rupture (OASR) and to identify obstetric factors associated with it. <jats:italic>Material and methods<\/jats:italic>. This is a retrospective case\u2013control study. The study population was made up of the 5,345 primiparous women aged 24\u201345 years who delivered vaginally with singleton live\u2010born neonates during 1990\u201399 at the Department of Obstetrics and Gynecology, Link\u00f6ping University Hospital, Sweden. As cases the 327 primiparous women aged 35\u201345 years at delivery were selected. For each case two primiparous controls ten years younger were selected, matched for gestational age and year of delivery, in all 654 controls. Maternal, obstetrical, and neonatal data were obtained from the delivery records. Obstetric factors for the development of OASR were assessed with multivariate logistic regression analysis. <jats:italic>Results.<\/jats:italic> No significant association was found between the primiparous age category and OASR. Vacuum extraction, forceps delivery, and the head circumference of the neonate were found to be independent risk factors for OASR, while the use of mediolateral episiotomy or epidural analgesia were independent protective factors for developing OASR. <jats:italic>Conclusions.<\/jats:italic> Primiparous women, 35 years of age or older, do not seem to have a greater risk of OASR than younger primiparous women. Risk factors for OASR are instrumental vaginal delivery and the size of the neonate. Mediolateral episiotomy and epidural analgesia seem to reduce the risk for OASR.<\/jats:p>","DOI":"10.1080\/00016340600839890","type":"journal-article","created":{"date-parts":[[2009,12,8]],"date-time":"2009-12-08T17:34:26Z","timestamp":1260293666000},"page":"1252-1258","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Obstetric anal sphincter rupture in older primiparous women: a case\u2013control study"],"prefix":"10.1111","volume":"85","author":[{"given":"CHRISTIAN","family":"DAHL","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"PREBEN","family":"KJ\u00d8LHEDE","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2010,12,31]]},"reference":[{"key":"e_1_2_8_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0028-2243(88)80007-8"},{"key":"e_1_2_8_3_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2168.1998.00858.x"},{"key":"e_1_2_8_4_2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0412.2003.00088.x"},{"key":"e_1_2_8_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/bjs.1800800343"},{"key":"e_1_2_8_6_2","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.308.6933.887"},{"key":"e_1_2_8_7_2","doi-asserted-by":"publisher","DOI":"10.3109\/00016349509024405"},{"key":"e_1_2_8_8_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1996.tb09557.x"},{"key":"e_1_2_8_9_2","doi-asserted-by":"publisher","DOI":"10.1097\/00006250-199907000-00005"},{"key":"e_1_2_8_10_2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0412.2001.080009830.x"},{"key":"e_1_2_8_11_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.0001-6349.2004.00346.x"},{"key":"e_1_2_8_12_2","unstructured":"Socialstyrelsen. 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