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No differences in the incidence of third trimester pregnancy complications, abnormal fetal karyotypes or malformations were found. The number of women with spontaneous onset of labor and the gestational age at delivery were similar in the IVF and control groups. In singleton deliveries, the birth weight was lower (<jats:italic>p<\/jats:italic>&lt;0.025) in the IVF group (median 3145 g, range 8904300 g) than in the control group (3399 g, 2592\u20134850 g), whereas in multiple gestation similar birth weights were found in the IVF and control groups. We conclude that the birth weight in singleton deliveries after IVF is lower than the birth weight in infertility patients treated differently. The cause of this difference remains obscure.<\/jats:p>","DOI":"10.3109\/00016349509008921","type":"journal-article","created":{"date-parts":[[2007,11,13]],"date-time":"2007-11-13T19:11:23Z","timestamp":1194981083000},"page":"129-131","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Perinatal outcome after <i>in vitro<\/i> fertilisation"],"prefix":"10.1111","volume":"74","author":[{"given":"Karsten","family":"Petersen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter J.","family":"Hornnes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susanne","family":"Ellingsen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Flemming","family":"Jensen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vibeke","family":"Brocks","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00f8rgen","family":"Starup","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joes Rams\u00f8e","family":"Jacobsen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anders Nyboe","family":"Andersen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,7]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(86)90470-9"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-2007-999587"},{"key":"e_1_2_1_4_1","first-page":"1229","article-title":"Birth in Great Britain resulting from assisted conception 1978\u20131987","volume":"300","author":"Beral V.","year":"1990","journal-title":"Brit Med J"},{"key":"e_1_2_1_5_1","first-page":"2649","article-title":"Short\u2010term luteinizing hormone\u2010releasing hormone agonist treatment: prospective trial of a novel ovarian stimulation regimen for in vitro fertilisation","volume":"52","author":"MacNamee M. 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