{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T13:13:53Z","timestamp":1775481233715,"version":"3.50.1"},"reference-count":32,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T00:00:00Z","timestamp":1736380800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"},{"start":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T00:00:00Z","timestamp":1736380800000},"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":["BJOG"],"published-print":{"date-parts":[[2025,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To evaluate the impact of twin dating by ultrasound\u2010measured crown\u2010rump length (CRL) of the larger (CRL\u2010L), smaller (CRL\u2010S) or mean twin measurement (CRL\u2010M) on the rates of preterm birth (PTB) and detection of small for gestational age (SGA) births.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>A retrospective cohort study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>A tertiary fetal medicine centre (London, UK).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Population or Sample<\/jats:title>\n                    <jats:p>All twin pregnancies between 1998 and 2023 who underwent first trimester CRL ultrasound assessment and fetal growth assessment.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Data collection included CRL measurement, estimated fetal weight (EFW), pregnancy outcome and birthweight (BW) for each twin. Pregnancies were retrospectively re\u2010dated by CRL\u2010S, CRL\u2010L and CRL\u2010M.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main Outcome Measures<\/jats:title>\n                    <jats:p>SGA\u2009&lt;\u200910th centile and extreme PTB rates (&lt;\u200928\u2009weeks).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In the 1129 twin pregnancies, median CRL\u2010S was 61\u2009mm (interquartile range [IQR]: 56.0\u201366.0) and CRL\u2010L was 63\u2009mm (IQR: 58.4\u201368.9) with a mean discordance of 4.0%. Prenatal SGA diagnosis occurred in 19.8% and 23.1% of smaller twins when dated by CRL\u2010S and CRL\u2010L, respectively. When pregnancies were dated by CRL\u2010M versus CRL\u2010S or CRL\u2010L, there was no difference in prenatal SGA diagnosis (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.275 and\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.419); SGA at birth (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.132 and\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.325); or extreme PTB (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u2009&gt;\u20090.999 and\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.765 respectively).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Dating by the smaller, larger or mean twin CRL does not significantly alter rates of extreme preterm birth, SGA detection or SGA birth. Dating by the mean twin CRL reduces stigmatisation of the smaller twin and retains the utility of accurate gestational age assessment without impacting clinical outcomes.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/1471-0528.18065","type":"journal-article","created":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T03:21:06Z","timestamp":1736392866000},"page":"648-655","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The Impact of Dating Twin Pregnancy by the Larger, Smaller or Mean Twin Crown\u2010Rump Length: A Retrospective Cohort Study"],"prefix":"10.1111","volume":"132","author":[{"given":"Gillian V.","family":"Blayney","sequence":"first","affiliation":[{"name":"Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Veronica","family":"Giorgione","sequence":"additional","affiliation":[{"name":"Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2393-7501","authenticated-orcid":false,"given":"Amar","family":"Bhide","sequence":"additional","affiliation":[{"name":"Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust  London UK"},{"name":"Vascular Biology Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5531-4301","authenticated-orcid":false,"given":"Basky","family":"Thilaganathan","sequence":"additional","affiliation":[{"name":"Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust  London UK"},{"name":"Vascular Biology Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London  London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,1,9]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/14651858.CD007058.pub3"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0029\u20107844(00)01131\u20105"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/s0002\u20109378(96)70408\u20108"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1469\u20100705.1997.09060367.x"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.21923"},{"key":"e_1_2_10_7_1","volume-title":"Twin and Triplet Pregnancy. 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