{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T11:09:45Z","timestamp":1785150585023,"version":"3.55.0"},"reference-count":29,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2019,11,28]],"date-time":"2019-11-28T00:00:00Z","timestamp":1574899200000},"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":["Aust NZ J Obst Gynaeco"],"published-print":{"date-parts":[[2020,8]]},"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Evidence suggests that the trend toward early planned births observed among singletons may be evident among twin pregnancies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Aims<\/jats:title><jats:p>To describe trends in gestational age at birth, pregnancy characteristics, neonatal morbidity and mortality among twin pregnancies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Population\u2010based data linkage study of twin births of \u226530\u00a0weeks of gestation without a major congenital anomaly born in 2003\u20132014 in New South Wales (NSW), Australia. Linked pregnancy and birth, hospital and mortality data were used. Generalised linear regression was used to assess linear trends. Risk difference (RD) and 95% confidence intervals were estimated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among 28\u00a0076 eligible twin births (14\u00a0038 pregnancies), 49% of births occurred prior to 37\u00a0weeks and 69% of births were planned (pre\u2010labour caesarean or induction of labour). There were increases over time in the proportion of twin births at preterm gestations (30\u201334\u00a0weeks (RD 2.1, 95% CI 0.1, 4.0), 35\u201336\u00a0weeks (RD 7.5, 95% CI 5.4, 9.7)) and in the rates of planned births (pre\u2010labour caesarean (RD 6.4, 95% CI 4.0, 8.8), induction (RD 4.6, 95% CI 2.6, 6.6)). There was no significant change in stillbirth or neonatal death rates, but there was an increase in neonatal morbidity over the study period. Concurrently, there were increases in the prevalence of gestational diabetes; and decreases in pregnancy hypertension, assisted reproductive technology use, small\u2010for\u2010gestational age and birthweight discordance.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Gestational age at birth among twin births is decreasing and birth intervention is increasing. There are increasing rates of neonatal morbidity, but no overall change in perinatal mortality.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ajo.13101","type":"journal-article","created":{"date-parts":[[2019,11,29]],"date-time":"2019-11-29T03:41:01Z","timestamp":1574998861000},"page":"541-547","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Gestational age, morbidity and mortality among twin births in New South Wales, Australia 2003\u20132014: A cohort study"],"prefix":"10.1111","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6024-2958","authenticated-orcid":false,"given":"Ibinabo","family":"Ibiebele","sequence":"first","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Northern Sydney Local Health District Kolling Institute Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacob B.","family":"Humphries","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Biostatistics Training Program New South Wales Ministry of Health Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siranda","family":"Torvaldsen","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"School of Public Health and Community Medicine University of New South Wales Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jane B.","family":"Ford","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Northern Sydney Local Health District Kolling Institute Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan M.","family":"Morris","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Department of Obstetrics and Gynaecology Royal North Shore Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer R.","family":"Bowen","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Department of Neonatology Royal North Shore Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5075-0227","authenticated-orcid":false,"given":"Deborah A.","family":"Randall","sequence":"additional","affiliation":[{"name":"Women and Babies Research The University of Sydney Northern Clinical School Sydney New South Wales Australia"},{"name":"Northern Sydney Local Health District Kolling Institute Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,11,28]]},"reference":[{"key":"e_1_2_7_2_1","unstructured":"Australian Institute of Health and Welfare.Perinatal deaths in Australia 2013\u20132014. Cat. no. PER 94.Canberra:AIHW 2018."},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.15821"},{"key":"e_1_2_7_4_1","unstructured":"Royal Australian and New Zealand College of Obstetricians and Gynaecologists.Management of monochorionic twin pregnancy (C\u2010Obs 42) 2017. [Accessed 14 May 2018.] Available from URL:https:\/\/www.ranzcog.edu.au\/Statements-Guidelines"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0000000000001709"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejogrb.2010.12.045"},{"key":"e_1_2_7_7_1","unstructured":"National Institute for Health and Clinical Excellence.Multiple pregnancy: the management of twin and triplet pregnancies in the antenatal period (Clinical guideline 129) 2011. [Accessed 27 March 2019.] Available from URL:https:\/\/www.nice.org.uk\/guidance\/CG129"},{"key":"e_1_2_7_8_1","unstructured":"Royal Australian and New Zealand College of Obstetricians and Gynaecologists.Timing of elective caesarean section at term (C\u2010Obs 23) 2014. [Accessed 14 May 2018.] Available from URL:https:\/\/www.ranzcog.edu.au\/Statements-Guidelines"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1186\/1742-4755-10-S1-S1"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(08)60074-4"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10995-011-0797-6"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2012.06.082"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2016-2002"},{"key":"e_1_2_7_14_1","unstructured":"Australian Institute of Health and Welfare.Perinatal Data visualisations 2010\u20132016. Cat. no. PER 98 2018. [Accessed 26 March 2019.] Available from URL:https:\/\/www.aihw.gov.au\/reports\/mothers-babies\/perinatal-dynamic-data-display\/data"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0000000000000578"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2288-12-149"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3016.2008.00980.x"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12887-015-0464-y"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0000000000002419"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2393-11-39"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.i4353"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1038\/jp.2014.119"},{"key":"e_1_2_7_23_1","unstructured":"Australian Institute of Health and Welfare.Labour and birth \u2013 Onset of labour 2017. [Accessed 7 May 2018.] Available from URL:http:\/\/analytics.aihw.gov.au\/Viewer\/VisualAnalyticsViewer_guest.jsp?reportPath=%2FAIHW%2FReleasedPublic%2FPerinatal%2FReports%2FOCT2017&reportName=Labour%20and%20birth%20-%20Onset%20of%20labour&reportViewOnly=true&viewerMode=modern&commentsEnabled=false&propertiesEnabled=false&appSwitcherDisabled=true"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1214939"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.2337\/dc09-1848"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajo.12457"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajo.12394"},{"key":"e_1_2_7_28_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajo.12447"},{"key":"e_1_2_7_29_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1701-2163(15)30865-3"},{"key":"e_1_2_7_30_1","doi-asserted-by":"publisher","DOI":"10.1093\/humrep\/det080"}],"container-title":["Australian and New Zealand Journal of Obstetrics and Gynaecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/ajo.13101","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1111\/ajo.13101","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/ajo.13101","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,5]],"date-time":"2023-09-05T17:29:37Z","timestamp":1693934977000},"score":1,"resource":{"primary":{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/10.1111\/ajo.13101"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,11,28]]},"references-count":29,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2020,8]]}},"alternative-id":["10.1111\/ajo.13101"],"URL":"https:\/\/doi.org\/10.1111\/ajo.13101","archive":["Portico"],"relation":{},"ISSN":["0004-8666","1479-828X"],"issn-type":[{"value":"0004-8666","type":"print"},{"value":"1479-828X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,11,28]]},"assertion":[{"value":"2019-07-21","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2019-10-27","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2019-11-28","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}