{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,26]],"date-time":"2025-09-26T22:17:28Z","timestamp":1758925048061},"reference-count":17,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2011,1,7]],"date-time":"2011-01-07T00:00:00Z","timestamp":1294358400000},"content-version":"vor","delay-in-days":6672,"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":[[1992,10]]},"abstract":"<jats:p><jats:italic>Objective<\/jats:italic>: To construct a birthweight\u2010for\u2010gestation chart based on a population\u2010based material of twins born during a restricted period of time.<\/jats:p><jats:p><jats:italic>Material and methods<\/jats:italic>: Nearly all live\u2010born twins born in Sweden between 1983 and 1985, 4737 all told, were included. Excluded from the analysis were 4.7% of the twins that were not on record at the Medical Birth Registry, 1.8% that died before or during birth, and 8.8% that were without a recorded date of birth or only had information on gestational duration estimated from the first day of the last menstrual period.<\/jats:p><jats:p><jats:italic>Results<\/jats:italic>: The standard deviation in birthweight was considerable in most gestational weeks; the range (\u00b12 SD) was 1000\u20133400 g even if exclusively twins (pregnancies) with estimated date of birth from ultrasound examination early in the second trimester were included. Intra\u2010pair discordance increased with gestational duration, especially for un\u2010like\u2010sexed twins, to reach over 400 g at term. On average, boys weighed 92 g more than girls and twins to multiparae weighed 250 g more than twins to primiparae. Maternal age affected birthweight for twins to primiparae, but not to multiparae.<\/jats:p><jats:p><jats:italic>Conclusion<\/jats:italic>: Although the problems with secular trends in birthweight were avoided by using a population\u2010based material during a restricted time period, and only twin pregnancies dated with ultrasound were included, the standard deviation in most gestational weeks was still considerable, reflecting the multiplicity of factors involved in determining the birthweight of twins.<\/jats:p>","DOI":"10.3109\/00016349209041441","type":"journal-article","created":{"date-parts":[[2007,11,22]],"date-time":"2007-11-22T00:45:29Z","timestamp":1195692329000},"page":"506-511","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["A birthweight\u2010for\u2010gestation standard based on 4737 twins born in Sweden between 1983 and 1985"],"prefix":"10.1111","volume":"71","author":[{"given":"H\u00e5kan","family":"Rydhstr\u00f6m","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,7]]},"reference":[{"key":"e_1_2_2_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-349-07434-1"},{"key":"e_1_2_2_3_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016347509156424"},{"key":"e_1_2_2_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1479-828X.1984.tb01488.x"},{"key":"e_1_2_2_5_1","first-page":"69","article-title":"Gestational age\u2010specific birthweights of twins versus singletons","volume":"40","author":"Luke B.","year":"1991","journal-title":"Acta Genet Med Gemellol"},{"key":"e_1_2_2_6_1","first-page":"111","volume-title":"Twinning and twins","author":"MacGillivray I.","year":"1988"},{"key":"e_1_2_2_7_1","volume-title":"Official Statistics of Sweden. Statistical Reports 1983\u201385","year":"1984"},{"key":"e_1_2_2_8_1","first-page":"1584","article-title":"Improved care and economical gains with increased use of ultrasound (in Swedish)","volume":"82","author":"Persson PH","year":"1985","journal-title":"Lakartidn"},{"key":"e_1_2_2_9_1","doi-asserted-by":"publisher","DOI":"10.1177\/140349489001800209"},{"key":"e_1_2_2_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1651-2227.1991.tb11945.x"},{"key":"e_1_2_2_11_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0001566000009326"},{"key":"e_1_2_2_12_1","first-page":"714","article-title":"The twin\u2010twin transfusion syndrome","volume":"76","author":"Blickstein I.","year":"1990","journal-title":"Obstet Gynecol"},{"key":"e_1_2_2_13_1","first-page":"98","article-title":"Classification of twins and neonatal mortality","volume":"74","author":"Bronsteen R.","year":"1989","journal-title":"Obstet Gynecol"},{"key":"e_1_2_2_14_1","doi-asserted-by":"publisher","DOI":"10.1159\/000240213"},{"key":"e_1_2_2_15_1","first-page":"35","article-title":"Fetal growth in twin pregnancies","volume":"37","author":"Neilson JP","year":"1988","journal-title":"Acta Genet Med Gemellol"},{"key":"e_1_2_2_16_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0001566000008291"},{"key":"e_1_2_2_17_1","first-page":"235","article-title":"Diminished biparietal diameter and abdominal circumference growth in twins","volume":"64","author":"Socol ML","year":"1984","journal-title":"Obstet Gynecol"},{"key":"e_1_2_2_18_1","unstructured":"Rydhstr\u00f6mH..Factors influencing twin perinatal mortality.Thesis Bloms Boktryckeri Lund1990."}],"container-title":["Acta Obstetricia et Gynecologica Scandinavica"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.3109%2F00016349209041441","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.3109\/00016349209041441","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.3109\/00016349209041441","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/pdf\/10.3109\/00016349209041441","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,4]],"date-time":"2023-09-04T20:02:39Z","timestamp":1693857759000},"score":1,"resource":{"primary":{"URL":"https:\/\/obgyn.onlinelibrary.wiley.com\/doi\/10.3109\/00016349209041441"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1992,10]]},"references-count":17,"journal-issue":{"issue":"7","published-print":{"date-parts":[[1992,10]]}},"alternative-id":["10.3109\/00016349209041441"],"URL":"https:\/\/doi.org\/10.3109\/00016349209041441","archive":["Portico"],"relation":{},"ISSN":["0001-6349","1600-0412"],"issn-type":[{"value":"0001-6349","type":"print"},{"value":"1600-0412","type":"electronic"}],"subject":[],"published":{"date-parts":[[1992,10]]},"assertion":[{"value":"2011-01-07","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}