{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T04:17:25Z","timestamp":1747196245309,"version":"3.40.5"},"reference-count":31,"publisher":"Public Library of Science (PLoS)","issue":"7","license":[{"start":{"date-parts":[[2022,7,14]],"date-time":"2022-07-14T00:00:00Z","timestamp":1657756800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>There is no standard birth weight curve for twins in Japan other than a prototype curve based on 1988\u20131991. Twins have a high perinatal mortality rate than singletons; therefore, we developed a new standard curve for twin birth weight using data from the 1995\u20132016 Vital Statistics and compared it with previous reports. We used 469,064 cases for analysis, excluding stillbirths and cases with missing values, and created a standard curve using LMS (statistical methods to vary the distribution by using skewness, median, and coefficient of variation) method. In comparison with previous reports, the mean birth weight decreased by 100\u2013200 g. The groups with the lowest neonatal death rates (NDRs) and infant death rates (IDRs) were those with a birth weight of 1,500\u20132,499 g (NDR: 0.3%, IDR: 0.6%) and those born at 34\u201336 weeks (NDR: 0.2%, IDR: 0.4%). Compared to these, the IDR was significantly higher in the 2,500\u20133,999 g group and the 37\u201339 weeks group (incidence rate ratio (IRR): 1.1 in the 2,500\u20133,999 g group, IRR: 1.3 in the 37w0d\u201339w6d group). In particular, the risks of neonatal mortality and infant mortality were higher in infants born at a birth weight above 3,500 g. Infants born at a birth weight above 3,500 g may include recipients of twin-to-twin transfusion syndrome. The most common causes of infant mortality are accidental death and sudden infant death syndrome (SIDS). We considered the possibility that infants treated as healthy newborns and whose mothers were discharged from the hospital without adequate twin care guidance may be more likely to experience unintentional accidents and SIDS at home. The present study suggested that creating a new twin birth weight standard curve and guidance on managing twins at home for full-term and normal birth weight infants may lead to a reduction in infant deaths.<\/jats:p>","DOI":"10.1371\/journal.pone.0271440","type":"journal-article","created":{"date-parts":[[2022,7,14]],"date-time":"2022-07-14T17:42:24Z","timestamp":1657820544000},"page":"e0271440","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":2,"title":["Birth weight reference for Japanese twins and risk factors for infant mortality: A population-based study"],"prefix":"10.1371","volume":"17","author":[{"given":"Yuri","family":"Ishida","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6049-0759","authenticated-orcid":true,"given":"Yo","family":"Takemoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masaya","family":"Kato","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7838-2158","authenticated-orcid":true,"given":"Mahbub","family":"Latif","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erika","family":"Ota","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naho","family":"Morisaki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Atsuo","family":"Itakura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2022,7,14]]},"reference":[{"key":"pone.0271440.ref001","doi-asserted-by":"crossref","first-page":"480","DOI":"10.2188\/jea.JE20100022","article-title":"The effect of an increase in the rate of multiple births on low-birth-weight and preterm deliveries during 1975\u20132008","volume":"20","author":"S. Ooki","year":"2010","journal-title":"J Epidemiol"},{"key":"pone.0271440.ref002","doi-asserted-by":"crossref","first-page":"165","DOI":"10.1017\/S0001566000002373","article-title":"Twinning rates in Japan, 1951\u20131990","volume":"41","author":"Y. Imaizumi","year":"1992","journal-title":"Acta Genet Med Gemellol (Roma)"},{"key":"pone.0271440.ref003","doi-asserted-by":"crossref","first-page":"31290","DOI":"10.1038\/srep31290","article-title":"Birthweight percentiles for twin birth neonates by gestational age in China","volume":"6","author":"B Zhang","year":"2016","journal-title":"Sci Rep"},{"key":"pone.0271440.ref004","doi-asserted-by":"crossref","first-page":"1984","DOI":"10.1093\/humrep\/dey294","article-title":"Prevalence and risk factors of zygotic splitting after 937 848 single embryo transfer cycles","volume":"33","author":"Y Ikemoto","year":"2018","journal-title":"Hum Reprod"},{"key":"pone.0271440.ref005","doi-asserted-by":"crossref","first-page":"803","DOI":"10.1007\/s10815-014-0225-0","article-title":"The incidence of monozygotic twinning in assisted reproductive technology: Analysis based on results from the 2010 Japanese ART national registry","volume":"31","author":"T Nakasuji","year":"2014","journal-title":"J Assist Reprod Genet"},{"key":"pone.0271440.ref006","doi-asserted-by":"crossref","first-page":"20","DOI":"10.1002\/rmb2.12074","article-title":"Assisted reproductive technology in Japan: A summary report for 2015 by the Ethics Committee of the Japan Society of Obstetrics and Gynecology","volume":"17","author":"H Saito","year":"2018","journal-title":"Reprod Med Biol"},{"key":"pone.0271440.ref007","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1016\/j.fertnstert.2015.10.002","article-title":"Impact of single embryo transfer policy on perinatal outcomes in fresh and frozen cycles-analysis of the Japanese Assisted Reproduction Technology registry between 2007 and 2012","volume":"105","author":"K Takeshima","year":"2016","journal-title":"Fertil Steril"},{"key":"pone.0271440.ref008","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.siny.2015.12.010","article-title":"Multiple gestations and preterm birth","volume":"21","author":"F Fuchs","year":"2016","journal-title":"Semin Fetal Neonatal Med"},{"key":"pone.0271440.ref009","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1097\/HJH.0000000000001846","article-title":"Blood pressure changes during twin pregnancies: The Japan Environment and Children\u2019s Study","volume":"37","author":"N Iwama","year":"2019","journal-title":"J Hypertens"},{"key":"pone.0271440.ref010","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1002\/uog.15821","article-title":"ISUOG Practice Guidelines: Role of ultrasound in twin pregnancy","volume":"47","author":"A Khalil","year":"2016","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0271440.ref011","doi-asserted-by":"crossref","first-page":"2518","DOI":"10.3390\/jcm9082518","article-title":"The association between hypertension in pregnancy and preterm birth with fetal growth restriction in singleton and twin pregnancy: Use of twin versus singleton charts","volume":"9","author":"E Kalafat","year":"2020","journal-title":"J Clin Med"},{"key":"pone.0271440.ref012","first-page":"80","article-title":"Perinatal morbidity and mortality in twin pregnancies in a Moroccan level-3 maternity ward","volume":"23","author":"Mel-M Boubkraoui","year":"2016","journal-title":"Pan Afr Med J"},{"key":"pone.0271440.ref013","doi-asserted-by":"crossref","first-page":"1229","DOI":"10.1038\/s41372-019-0427-5","article-title":"Birth weight discordance in very low birth weight twins: Mortality, morbidity, and neurodevelopment","volume":"39","author":"NS Boghossian","year":"2019","journal-title":"J Perinatol"},{"key":"pone.0271440.ref014","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1017\/thg.2012.156","article-title":"Infant mortality among singletons and twins in Japan during 1999\u20132008 on the basis of risk factors","volume":"16","author":"Y Imaizumi","year":"2013","journal-title":"Twin Res Hum Genet"},{"key":"pone.0271440.ref015","doi-asserted-by":"crossref","first-page":"702","DOI":"10.1111\/ped.12331","article-title":"New Japanese neonatal anthropometric charts for gestational age at birth","volume":"56","author":"K Itabashi","year":"2014","journal-title":"Pediatr Int"},{"key":"pone.0271440.ref016","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1186\/1471-2393-4-2","article-title":"Reference birthweight range for multiple birth neonates in Japan","volume":"4","author":"N. Kato","year":"2004","journal-title":"BMC Pregnancy Childbirth"},{"key":"pone.0271440.ref017","first-page":"45","article-title":"The LMS method for constructing normalized growth standards","volume":"44","author":"TJ Cole","year":"1990","journal-title":"Eur J Clin Nutr"},{"key":"pone.0271440.ref018","doi-asserted-by":"crossref","first-page":"1101","DOI":"10.1016\/S0002-9378(97)70023-1","article-title":"New birth weight nomograms for twin gestation on the basis of accurate gestational age","volume":"177","author":"SB Cohen","year":"1997","journal-title":"Am J Obstet Gynecol"},{"key":"pone.0271440.ref019","doi-asserted-by":"crossref","first-page":"31396","DOI":"10.1038\/srep31396","article-title":"Japanese secular trends in birthweight and the prevalence of low birthweight infants during the last three decades: A population-based study","volume":"6","author":"Y Takemoto","year":"2016","journal-title":"Sci Rep"},{"key":"pone.0271440.ref020","doi-asserted-by":"crossref","first-page":"1592","DOI":"10.2105\/AJPH.94.9.1592","article-title":"Thinness among young Japanese women","volume":"94","author":"H Takimoto","year":"2004","journal-title":"Am J Public Health"},{"key":"pone.0271440.ref021","doi-asserted-by":"crossref","first-page":"509","DOI":"10.1007\/s10995-016-2134-6","article-title":"Assessing weight gain by the 2009 Institute of Medicine guidelines and perinatal outcomes in twin pregnancy","volume":"21","author":"T Ozcan","year":"2017","journal-title":"Matern Child Health J"},{"key":"pone.0271440.ref022","doi-asserted-by":"crossref","first-page":"1137","DOI":"10.1111\/j.1447-0756.2012.01848.x","article-title":"Gestational bodyweight gain among underweight Japanese women related to small-for-gestational-age birth","volume":"38","author":"N Harita","year":"2012","journal-title":"J Obstet Gynaecol Res"},{"key":"pone.0271440.ref023","unstructured":"Japanese Ministry of Health, Labour and Welfare. Vital statistics report; 2016 [cited 2017 April 8]. https:\/\/www.e-stat.go.jp\/."},{"key":"pone.0271440.ref024","doi-asserted-by":"crossref","first-page":"1025","DOI":"10.1093\/humrep\/dei419","article-title":"Perinatal outcome of 12,021 singleton and 3108 twin births after non-IVF-assisted reproduction: A cohort study","volume":"21","author":"W Ombelet","year":"2006","journal-title":"Hum Reprod"},{"key":"pone.0271440.ref025","doi-asserted-by":"crossref","first-page":"1180","DOI":"10.1016\/j.fertnstert.2015.12.131","article-title":"Assisted reproductive technology and risk of adverse obstetric outcomes in dichorionic twin pregnancies: A systematic review and meta-analysis","volume":"105","author":"JB Qin","year":"2016","journal-title":"Fertil Steril"},{"key":"pone.0271440.ref026","first-page":"w14581","article-title":"Do late preterm twins face an increased neonatal morbidity compared with singletons?","volume":"148","author":"JA Zdanowicz","year":"2018","journal-title":"Swiss Med Wkly"},{"key":"pone.0271440.ref027","doi-asserted-by":"crossref","first-page":"1409","DOI":"10.1111\/j.1447-0756.2011.01552.x","article-title":"Impact of maternal age on the incidence of obstetrical complications in Japan","volume":"37","author":"Y Matsuda","year":"2011","journal-title":"J Obstet Gynaecol Res"},{"key":"pone.0271440.ref028","doi-asserted-by":"crossref","first-page":"1113","DOI":"10.1056\/NEJM199504273321701","article-title":"Association of young maternal age with adverse reproductive outcomes","volume":"332","author":"AM Fraser","year":"1995","journal-title":"N Engl J Med"},{"key":"pone.0271440.ref029","doi-asserted-by":"crossref","first-page":"110","DOI":"10.1111\/jog.14069","article-title":"Association between socioeconomic status and small-for-gestational-age in Japan: A single center retrospective cohort study","volume":"46","author":"I Hayashi","year":"2020","journal-title":"J Obstet Gynaecol Res"},{"key":"pone.0271440.ref030","doi-asserted-by":"crossref","first-page":"198","DOI":"10.1016\/j.ejogrb.2016.09.019","article-title":"Twin pregnancies after assisted reproductive technologies: The role of maternal age on pregnancy outcome","volume":"206","author":"S Pinzauti","year":"2016","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"pone.0271440.ref031","unstructured":"Japan Society of Obstetrics and Gynecology. ART data book; Year of Publication [cited 2018 April 15]. http:\/\/plaza.umin.ac.jp\/~jsog-art\/."}],"container-title":["PLOS ONE"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0271440","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,7,14]],"date-time":"2022-07-14T17:43:11Z","timestamp":1657820591000},"score":1,"resource":{"primary":{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0271440"}},"subtitle":[],"editor":[{"given":"Jo\u00ebl R","family":"Drevet","sequence":"first","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]}],"short-title":[],"issued":{"date-parts":[[2022,7,14]]},"references-count":31,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2022,7,14]]}},"URL":"https:\/\/doi.org\/10.1371\/journal.pone.0271440","relation":{},"ISSN":["1932-6203"],"issn-type":[{"type":"electronic","value":"1932-6203"}],"subject":[],"published":{"date-parts":[[2022,7,14]]}}}