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The secondary aim was to study the association between<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>and anal incontinence 15\u201323 years later.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>This was a cross\u2010sectional study including 8137 primiparous women in Trondheim, Norway, from 1990 to 1997. The outcome measure was the adjusted odds ratio (<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>) for<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>between delivery groups. A total of 1122 women responded to a postal questionnaire containing the Colorectal\u2010Anal Distress Inventory (<jats:styled-content style=\"fixed-case\">CRADI<\/jats:styled-content>) in 2013. The<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>for anal incontinence and the difference in<jats:styled-content style=\"fixed-case\">CRADI<\/jats:styled-content>score between women with and without<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>were calculated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p><jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>prevalence was 2% for<jats:styled-content style=\"fixed-case\">NVD<\/jats:styled-content>and 10% for<jats:styled-content style=\"fixed-case\">OVD<\/jats:styled-content>(10%<jats:styled-content style=\"fixed-case\">FD<\/jats:styled-content>, 9%<jats:styled-content style=\"fixed-case\">VD<\/jats:styled-content>).<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>for<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>was 5.01 (95%<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>3.85\u20136.51) comparing<jats:styled-content style=\"fixed-case\">OVD<\/jats:styled-content>with<jats:styled-content style=\"fixed-case\">NVD<\/jats:styled-content>. There was no difference between<jats:styled-content style=\"fixed-case\">FD<\/jats:styled-content>and<jats:styled-content style=\"fixed-case\">VD<\/jats:styled-content>(<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>1.15, 95%<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>0.79\u20131.67).<jats:styled-content style=\"fixed-case\">FD<\/jats:styled-content>was associated with higher risk of fourth degree perineal tear than<jats:styled-content style=\"fixed-case\">VD<\/jats:styled-content>(<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>5.08, 95%<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>1.47\u201317.49).<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>was associated with increased risk of leakage of well\u2010formed (<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>8.61, 95%<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>3.08\u201324.12) and loose stool (<jats:styled-content style=\"fixed-case\">aOR<\/jats:styled-content>2.75, 95%<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>1.43\u20135.27) and higher<jats:styled-content style=\"fixed-case\">CRADI<\/jats:styled-content>score (Mann\u2013Whitney<jats:italic>U<\/jats:italic>\u2010test,<jats:italic>p<\/jats:italic>= 0.01).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p><jats:styled-content style=\"fixed-case\">OVD<\/jats:styled-content>was associated with increased risk of<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>.<jats:styled-content style=\"fixed-case\">FD<\/jats:styled-content>was associated with higher risk of fourth degree perineal tear compared with<jats:styled-content style=\"fixed-case\">VD<\/jats:styled-content>.<jats:styled-content style=\"fixed-case\">OASIS<\/jats:styled-content>was associated with increased risk of anal incontinence and higher<jats:styled-content style=\"fixed-case\">CRADI<\/jats:styled-content>score 15\u201323 years later.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.12898","type":"journal-article","created":{"date-parts":[[2016,3,19]],"date-time":"2016-03-19T02:21:04Z","timestamp":1458354064000},"page":"941-947","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Obstetric anal sphincter injury and incontinence 15\u201323 years after vaginal delivery"],"prefix":"10.1111","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5650-4924","authenticated-orcid":false,"given":"Tuva K.","family":"Halle","sequence":"first","affiliation":[{"name":"Faculty of Medicine Norwegian University of Science and Technology Trondheim Norway"},{"name":"Department of Obstetrics and Gynecology Trondheim University Hospital Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1788-4063","authenticated-orcid":false,"given":"Kjell \u00c5.","family":"Salvesen","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine Children's and Women's Health Norwegian University of Science and Technology Trondheim Norway"},{"name":"National Center for Fetal Medicine Trondheim University Hospital Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9392-1674","authenticated-orcid":false,"given":"Ingrid","family":"Voll\u00f8yhaug","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Trondheim University Hospital Trondheim Norway"},{"name":"Department of Laboratory Medicine Children's and Women's Health Norwegian University of Science and Technology Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,4,7]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e3181e2f50b"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2009.04.033"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/1471-0528.12363"},{"key":"e_1_2_9_5_1","unstructured":"FernandoRJ SultanAH FreemanRM WilliamsAA AdamsEJ.The Management of Third\u2010 and Fourth\u2010Degree Perineal Tears. 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