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The population\u2010based large control (without any defects) data set of the Hungarian Case\u2010Control Surveillance System of Congenital Abnormalities was evaluated.<\/jats:p><jats:p>Of 38\u2003151 controls, 3869 (10.1%) had medically recorded and treated nausea and vomiting during pregnancy. The proportion of mothers who later delivered girls was higher in this group. Mothers with nausea and vomiting in pregnancy had a somewhat (0.3\u2003week) longer gestational age and a lower proportion of preterm births (6.4% vs. 9.5%). This finding may be connected with the favourable hormonal milieu (larger placenta, higher level of chorionic gonadotrophin and oestrogens) of pregnant women with nausea and vomiting.<\/jats:p>","DOI":"10.1111\/j.1365-3016.2004.00568.x","type":"journal-article","created":{"date-parts":[[2004,7,16]],"date-time":"2004-07-16T07:33:08Z","timestamp":1089963188000},"page":"253-259","source":"Crossref","is-referenced-by-count":41,"title":["Association between severe nausea and vomiting in pregnancy and lower rate of preterm births"],"prefix":"10.1111","volume":"18","author":[{"given":"Andrew 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