{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T07:09:48Z","timestamp":1784790588193,"version":"3.55.0"},"reference-count":26,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T00:00:00Z","timestamp":1774396800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T00:00:00Z","timestamp":1774396800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Aust NZ J Obst Gynaeco"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Aim<\/jats:title>\n                    <jats:p>This study aims to identify factors associated with spontaneous vaginal birth in nulliparous women.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Material and Methods<\/jats:title>\n                    <jats:p>Design: Retrospective cohort study. Setting: All public and private maternity units in Queensland, Australia. Population: Nulliparous women who labour and birth a singleton baby at term from 1st January 2017\u201331st December 2018. Main outcome measure: Non\u2010instrumental spontaneous vaginal birth. Data from Perinatal Data Collection and Queensland Admitted Patient Data Collection were extracted. Participants were categorised by labour onset (spontaneous or induced). Multivariable stepwise regression models identified independent predictive factors associated with spontaneous vaginal birth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>37\u2009569 participants were included. Younger maternal age compared to 40+ was associated with higher odds of spontaneous vaginal birth (spontaneous labours &lt;\u200920: OR 3.723, 20\u201324: OR 2.545, 25\u201329 OR 2.062, 30\u201334 OR 1.522 and induced labours &lt;\u200920 OR 4.345, 20\u201324 OR 3.031, 25\u201329 OR 2.031, 30\u201334 OR 1.641). Advanced gestation \u2265\u200942\u2009weeks decreased spontaneous vaginal birth odds versus 38\u2009weeks (spontaneous OR 0.445, induced 0.334). Breech presentation lowered SVB odds (spontaneous OR 0.067, induced OR 0.179). Absence of cardiotocography (spontaneous OR 3.444) and absence of fetal scalp lactate (spontaneous OR 3.885, induced OR 3.081) increased spontaneous vaginal birth likelihood. Women without epidurals (spontaneous OR 2.981, induced OR 2.552) were more likely to have spontaneous vaginal birth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The characteristics with the largest magnitude of effect on spontaneous vaginal birth were similar in both spontaneous and induced labours. Interventions during spontaneous labour were associated with reduced odds of spontaneous vaginal birth.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/ajo.70104","type":"journal-article","created":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T13:13:48Z","timestamp":1774444428000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Attributes of Nulliparous Women Who Have a Spontaneous Vaginal Birth in Queensland: A Retrospective Cohort Study"],"prefix":"10.1111","volume":"66","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1817-022X","authenticated-orcid":false,"given":"Monique","family":"Hamilton","sequence":"first","affiliation":[{"name":"Women's and Childrens Service, Sunshine Coast Hospital and Health Service  Birtinya Queensland Australia"},{"name":"The University of Queensland  Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren","family":"Kearney","sequence":"additional","affiliation":[{"name":"The University of Queensland  Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John M. D.","family":"Thompson","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences University of Aukland  Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7366-042X","authenticated-orcid":false,"given":"Rachael","family":"Nugent","sequence":"additional","affiliation":[{"name":"Women's and Childrens Service, Sunshine Coast Hospital and Health Service  Birtinya Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,3,25]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(18)31928-7"},{"key":"e_1_2_8_3_1","volume-title":"Australia's Mothers and Babies","author":"Australian Institute of Health and Welfare","year":"2024"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(18)31930-5"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12884-016-0824-0"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.wombi.2023.08.009"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pmed.0050144"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/1471-0528.12177"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajo.12182"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0020-7292(99)00181-2"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1523-536X.2010.00409.x"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0210655"},{"issue":"7","key":"e_1_2_8_13_1","article-title":"Induction of Labour at or Beyond 37\u2009Weeks' Gestation","volume":"7","author":"Middleton P.","year":"2020","journal-title":"Cochrane Database of Systematic Reviews"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/aogs.14785"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0412.2011.01298.x"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmjopen-2020-047040"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.midw.2018.10.013"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1800566"},{"issue":"2","key":"e_1_2_8_19_1","article-title":"Continuous Cardiotocography (CTG) as a Form of Electronic Fetal Monitoring (EFM) for Fetal Assessment During Labour","volume":"2","author":"Alfirevic Z.","year":"2017","journal-title":"Cochrane Database of Systematic Reviews"},{"key":"e_1_2_8_20_1","article-title":"Amniotomy for Shortening Spontaneous Labour","volume":"6","author":"Smyth R. M.","year":"2013","journal-title":"Cochrane Database of Systematic Reviews"},{"key":"e_1_2_8_21_1","article-title":"Oxytocin Versus no Treatment or Delayed Treatment for Slow Progress in the First Stage of Spontaneous Labour","volume":"6","author":"Bugg G. J.","year":"2013","journal-title":"Cochrane Database of Systematic Reviews"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/14651858.CD006794.pub4"},{"key":"e_1_2_8_23_1","unstructured":"\u201cCare in Labour in the Abscence of Pregnancy Complications (C\u2010Obs 31)2023 17\/11\/2024 [pp. 1\u201371] \u201dhttps:\/\/ranzcog.edu.au\/wp\u2010content\/uploads\/Care\u2010Labour\u2010Absence\u2010Pregnancy\u2010Complications.pdf."},{"issue":"5","key":"e_1_2_8_24_1","article-title":"Epidural Versus Non\u2010Epidural or No Analgesia for Pain Management in Labour","volume":"5","author":"Anim\u2010Somuah M.","year":"2018","journal-title":"Cochrane Database of Systematic Reviews"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajo.13045"},{"issue":"5","key":"e_1_2_8_26_1","article-title":"Immersion in Water During Labour and Birth","volume":"5","author":"Cluett E. 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