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Each group included 63 women (type 1 DM, n = 39; type 2 DM, n = 24).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of 269 565 deliveries, 68 (0.025%) were twins of mothers with pregestational DM, with 28\/63 (44.4%) conceptions achieved with assisted reproduction technology. Among women with type 1 DM, hypertensive complications were more common among those with twins than among controls (13% versus 3%, <jats:italic>P =<\/jats:italic> 0.02); the rate of preterm birth was higher (69% versus 15%, <jats:italic>P<\/jats:italic> &lt; 0.001); and the rate of admission to the neonatal intensive care unit was higher (51% versus 21%, <jats:italic>P<\/jats:italic> = 0.005). Twin pregnancy was an independent risk factor for adverse perinatal outcomes regardless of the type of diabetes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Twin pregnancy in women with either type of DM dramatically increased the risk of perinatal morbidity. In mothers with type 1 DM, twin pregnancy was more often associated with hypertensive complications than singleton pregnancy. Transfer of more than one embryo should be avoided if ART is needed in a woman with DM.<\/jats:p><\/jats:sec>","DOI":"10.1016\/j.ijgo.2014.01.022","type":"journal-article","created":{"date-parts":[[2014,4,5]],"date-time":"2014-04-05T15:36:39Z","timestamp":1396712199000},"page":"83-87","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":2,"title":["Twin pregnancy among women with pregestational type 1 or type 2 diabetes mellitus"],"prefix":"10.1002","volume":"126","author":[{"given":"Nieves L.","family":"Gonz\u00e1lez Gonz\u00e1lez","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Enrique","family":"Gonz\u00e1lez D\u00e1vila","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria","family":"Goya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bego\u00f1a","family":"Vega","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mercedes","family":"Hern\u00e1ndez Suarez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose L.","family":"Bartha","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2014,4,5]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1053\/j.semperi.2012.02.001"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1097\/GRF.0b013e3182446f51"},{"issue":"2","key":"e_1_2_6_4_2","first-page":"646","article-title":"Data Base of Spanish Society of Perinatal Medicine","volume":"49","author":"Gonz\u00e1lez Gonz\u00e1lez N.L.","year":"2006","journal-title":"Prog Obstet Ginecol"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2007.01644.x"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ogc.2010.02.014"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1464-5491.2011.03366.x"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.3109\/14767058.2011.622009"},{"issue":"1","key":"e_1_2_6_9_2","doi-asserted-by":"crossref","first-page":"S62","DOI":"10.2337\/dc10-S062","article-title":"Diagnosis and classification of diabetes mellitus","volume":"33","author":"American Diabetes Association","year":"2010","journal-title":"Diabetes Care"},{"issue":"4","key":"e_1_2_6_10_2","first-page":"249","article-title":"Diabetes and pregnancy. 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