{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T20:48:08Z","timestamp":1786999688617,"version":"build-2736575974"},"reference-count":30,"publisher":"Cambridge University Press (CUP)","issue":"2","license":[{"start":{"date-parts":[[2023,5,4]],"date-time":"2023-05-04T00:00:00Z","timestamp":1683158400000},"content-version":"unspecified","delay-in-days":33,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/"}],"content-domain":{"domain":["cambridge.org"],"crossmark-restriction":true},"short-container-title":["Twin Res Hum Genet"],"published-print":{"date-parts":[[2023,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Whether the decline of birth weight (BW) reported in developed countries in the early 2000s is ongoing remains unknown. Furthermore, despite recent sharp increases in twin births, comparing secular trends of BW between singletons and twins is difficult, as studies have rarely examined secular trends of BW in twins and singletons simultaneously. Therefore, this study aimed to investigate the most recent 20-year trends (2000\u20132020) of BW in twins and singletons in South Korea. Annual natality files from 2000 to 2020 obtained from the Korean Statistical Information Service were analyzed. A yearly decrease of BW was 3 g among singletons and 5 to 6 g in twins from 2000 to 2020, indicating a widening gap of BW between twins and singletons with increasing years. Gestational age (GA) also decreased in twins and singletons with yearly decreases of 0.28 days in singletons and 0.41 days in twins. Whereas BW decreased in term (GA \u2265 37 weeks), and very preterm groups (28 weeks \u2264 GA &lt; 32 weeks) from 2000 to 2020 in twins and singletons, it increased in moderate to late preterm (32 weeks \u2264 GA &lt; 37 weeks) groups, indicating a non-linear relationship between BW and GA. The prevalence of macrosomia (BW &gt; 4000 g) in singletons decreased from 2000 to 2020, whereas low birth weight (LBW; BW &lt; 2500 g) increased in twins and singletons. LBW is associated with adverse health outcomes. Effective public health strategies aiming at reduction in the incidence of LBW in the population should be developed.<\/jats:p>","DOI":"10.1017\/thg.2023.16","type":"journal-article","created":{"date-parts":[[2023,5,4]],"date-time":"2023-05-04T04:41:43Z","timestamp":1683175303000},"page":"171-176","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":6,"title":["Secular Trends of Birth Weight in Twins and Singletons in South Korea from 2000 to 2020"],"prefix":"10.1017","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1635-7974","authenticated-orcid":false,"given":"Yoon-Mi","family":"Hur","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2023,5,4]]},"reference":[{"key":"S1832427423000166_ref17","doi-asserted-by":"publisher","DOI":"10.1093\/humrep\/deab029"},{"key":"S1832427423000166_ref19","doi-asserted-by":"publisher","DOI":"10.1186\/s12889-021-11185-x"},{"key":"S1832427423000166_ref15","unstructured":"Korean Statistical Information Service. (2022). The Korean Statistical Information Service. https:\/\/kosis.kr\/eng\/statisticsList\/statisticsListIndex.do?menuId=M_01_01&vwcd=MT_ETITLE&parmTabId=M_01_01"},{"key":"S1832427423000166_ref18","first-page":"516","article-title":"Deliveries, mothers and newborn infants in Sweden, 1973\u20132000. Trends in obstetrics as reported to the Swedish Medical Birth Register","volume":"82","author":"Odlind","year":"2003","journal-title":"Acta Obstetricia et Gynecologica Scandinavica"},{"key":"S1832427423000166_ref23","doi-asserted-by":"publisher","DOI":"10.1016\/j.jped.2013.01.003"},{"key":"S1832427423000166_ref13","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dyx031"},{"key":"S1832427423000166_ref27","unstructured":"World Health Organization (WHO). (2004). International statistical classification of diseases and related health problems (10th rev., 2nd ed.)."},{"key":"S1832427423000166_ref28","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0181164"},{"key":"S1832427423000166_ref11","doi-asserted-by":"publisher","DOI":"10.1111\/jog.14787"},{"key":"S1832427423000166_ref5","first-page":"49","article-title":"Assisted reproductive technology and trends in low birthweight--Massachusetts, 1997\u20132004","volume":"58,","year":"2009","journal-title":"Morbidity and Mortality Weekly Report"},{"key":"S1832427423000166_ref1","doi-asserted-by":"publisher","DOI":"10.1053\/sper.2002.34772"},{"key":"S1832427423000166_ref6","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.aje.a008966"},{"key":"S1832427423000166_ref12","doi-asserted-by":"publisher","DOI":"10.1017\/thg.2021.23"},{"key":"S1832427423000166_ref25","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000141442.59573.cd"},{"key":"S1832427423000166_ref16","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3016.2009.01075.x"},{"key":"S1832427423000166_ref26","doi-asserted-by":"publisher","DOI":"10.1038\/srep31396"},{"key":"S1832427423000166_ref22","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2393-14-105"},{"key":"S1832427423000166_ref3","doi-asserted-by":"publisher","DOI":"10.1162\/qjec.122.1.409"},{"key":"S1832427423000166_ref9","doi-asserted-by":"publisher","DOI":"10.1093\/humrep\/deq160"},{"key":"S1832427423000166_ref24","doi-asserted-by":"crossref","first-page":"440","DOI":"10.1034\/j.1600-0412.2000.079006440.x","article-title":"Birthweight by gestational age in Norway","volume":"79","author":"Skjaerven","year":"2000","journal-title":"Acta Obstetricia et Gynecologica Scandinavica"},{"key":"S1832427423000166_ref29","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/30.6.1233"},{"key":"S1832427423000166_ref8","doi-asserted-by":"publisher","DOI":"10.1001\/archpedi.154.8.778"},{"key":"S1832427423000166_ref10","first-page":"450","article-title":"Birthweight percentiles by gestational age in multiple births. A population-based study of Norwegian twins and triplets","volume":"79,","author":"Glinianaia","year":"2000","journal-title":"Acta Obstetricia et Gynecologica Scandinavica"},{"key":"S1832427423000166_ref14","unstructured":"Korea Centers for Disease Control & Prevention. (2019). National Health and Nutrition Examination Survey, Statistical Information Report, 2019."},{"key":"S1832427423000166_ref2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-3016.2003.00496.x"},{"key":"S1832427423000166_ref7","doi-asserted-by":"publisher","DOI":"10.5468\/ogs.20133"},{"key":"S1832427423000166_ref4","doi-asserted-by":"publisher","DOI":"10.1016\/j.pedneo.2019.01.012"},{"key":"S1832427423000166_ref21","doi-asserted-by":"publisher","DOI":"10.2337\/diacare.22.7.1201"},{"key":"S1832427423000166_ref30","doi-asserted-by":"publisher","DOI":"10.1136\/bmjopen-2019-029201"},{"key":"S1832427423000166_ref20","doi-asserted-by":"publisher","DOI":"10.1038\/oby.2006.143"}],"container-title":["Twin Research and Human Genetics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S1832427423000166","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,12,11]],"date-time":"2023-12-11T20:39:03Z","timestamp":1702327143000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S1832427423000166\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,4]]},"references-count":30,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2023,4]]}},"alternative-id":["S1832427423000166"],"URL":"https:\/\/doi.org\/10.1017\/thg.2023.16","relation":{},"ISSN":["1832-4274","1839-2628"],"issn-type":[{"value":"1832-4274","type":"print"},{"value":"1839-2628","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,4]]},"assertion":[{"value":"\u00a9 The Author(s), 2023. Published by Cambridge University Press on behalf of International Society for Twin Studies","name":"copyright","label":"Copyright","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is used to distribute the re-used or adapted article and the original article is properly cited. The written permission of Cambridge University Press must be obtained prior to any commercial use.","name":"license","label":"License","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This content has been made available to all.","name":"free","label":"Free to read"}]}}