{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T19:10:57Z","timestamp":1768590657332,"version":"3.49.0"},"reference-count":23,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2021,1,12]],"date-time":"2021-01-12T00:00:00Z","timestamp":1610409600000},"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":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[2021,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Large birthweight discrepancy has been identified as a risk factor for perinatal morbidity and mortality in twin pregnancies. However, it remains unclear whether such discordance can be predicted by various biological indices with specific cut\u2010off values, and how these depend on the gestational age. We aimed to determine the most effective way to predict large birthweight discordance at various gestational ages.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>A retrospective cohort study of dichorionic twins, live\u2010born between 2008 and 2018, was conducted. Discordances in biparietal diameter, head circumference, humerus and femur length, abdominal circumference, and estimated fetal weight were calculated\u2014([larger twin\u00a0\u2212\u00a0smaller twin]\u00a0\/\u00a0larger twin)\u00a0\u00d7\u00a0100%\u2014and compared between those with and without a large birthweight discordance (\u226520%). Receiver operating characteristic curves were constructed to analyze the predictive characteristics of each parameter.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of 598 dichorionic twin pregnancies included, 83 (13.9%) had a birthweight discordance \u226520%. Group differences in biparietal diameter and head circumference discordance were the earliest to emerge (before 20\u00a0weeks of gestation), but became insignificant after 36\u00a0weeks, followed by humerus and femur length, estimated fetal weight discordance (after 20\u00a0weeks), and abdominal circumference discordance (after 28\u00a0weeks). The best predictors (with cut\u2010off values) were discordance in biparietal diameter \u22657.8% at &lt;20\u00a0weeks, head circumference \u22654.5% at 20\u201023<jats:sup>+6<\/jats:sup>\u00a0weeks, humerus length \u22654.5% at 24\u201027<jats:sup>+6<\/jats:sup>\u00a0weeks, and estimated fetal weight discordance (\u226511.6% at 28\u201031<jats:sup>+6<\/jats:sup>\u00a0weeks, \u226510.5% at 32\u201035<jats:sup>+6<\/jats:sup>\u00a0weeks, and \u226515.0% \u226536\u00a0weeks), with sensitivity and specificity of 52%\u201077% and 69%\u201082%, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Different predictors and cut\u2010off values may be useful for predicting large inter\u2010twin birthweight discordance in dichorionic twins at different gestational ages. It is more accurate to use biparietal diameter and head circumference discordance in the early second trimester, humerus length discordance in the late second trimester, and estimated fetal weight discordance in the third trimester.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.14055","type":"journal-article","created":{"date-parts":[[2020,11,30]],"date-time":"2020-11-30T19:50:22Z","timestamp":1606765822000},"page":"908-916","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Ultrasound in the prediction of birthweight discordance in dichorionic twins"],"prefix":"10.1111","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7911-2264","authenticated-orcid":false,"given":"Ting","family":"Lei","sequence":"first","affiliation":[{"name":"Department of Ultrasonic Medicine Fetal Medical Center the First Affiliated Hospital of Sun Yat\u2010sen University Guangzhou 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