| Trends in incidence and mortality for triplets in Norway 1967-2006: the influence of assisted reproductive technologies. | |
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MedLine Citation:
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PMID: 20236102 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To assess changes in incidence rates and outcomes of triplets over 40 years with a particular focus on the influence of assisted reproductive technology (ART). DESIGN: Population-based cohort study. SETTING: The Medical Birth Registry of Norway. POPULATION: 2.18 million pregnancies, including 448 sets of triplets and 27,575 twin pairs, covering the years 1967-2006. Since 1988, pregnancies from ART have been available through a separate registry and linked with the birth record. METHODS: Incidence rates and outcomes for triplets were analysed and compared with those for singletons and twins. Relative risks were estimated between time periods and between ART and non-ART pregnancies. MAIN OUTCOME MEASURES: Incidence rates, birthweight, gestational age and perinatal mortality. RESULTS: The total triplet rate per 10,000 pregnancies increased from 1.0 during 1967-71 to 3.5 during 1987-92, followed by a decline to 2.7 during 2002-06. After excluding ART pregnancies, the incidence was more than doubled at the end of the study period. The mean gestational age and birthweight of triplets were significantly lower during 1988-2006 than 1967-87, but similar for ART and non-ART triplets in the last period. The caesarean rate in triplets increased from 47 to 92%. The relative risk of perinatal death in triplets relative to singletons did not change after the introduction of ART [before: relative risk, 8.9 (95% confidence interval, 6.8-11.7); after: relative risk, 10.4 (95% confidence interval, 8.3-13.0)]. CONCLUSIONS: The triplet incidence rate in Norway has more than doubled during the last 40 years, even after excluding ART pregnancies. The risk of perinatal death in triplets is ten times higher relative to singletons and has not changed during this 40-year period, independent of the introduction of ART. |
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Authors:
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A Tandberg; T Bj?rge; O Nyg?rd; P E B?rdahl; R Skjaerven |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-03-17 |
Journal Detail:
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Title: BJOG : an international journal of obstetrics and gynaecology Volume: 117 ISSN: 1471-0528 ISO Abbreviation: BJOG Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-04-08 Completed Date: 2010-06-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100935741 Medline TA: BJOG Country: England |
Other Details:
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Languages: eng Pagination: 667-75 Citation Subset: AIM; IM |
Affiliation:
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Department of Obstetrics and Gynaecology, Haukeland University Hospital, Bergen, Norway. anne.tandberg@isf.uib.no |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Birth Weight Cesarean Section / statistics & numerical data Female Gestational Age Humans Incidence Infant Mortality / trends Infant, Newborn Maternal Age Norway / epidemiology Pregnancy Pregnancy, Multiple / statistics & numerical data* Registries Reproductive Techniques, Assisted / statistics & numerical data* Triplets* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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