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TitleA study of multiple deliveries in Portugal: indications of an Iberian Peninsula Pattern
Author(s)Fuster, Vicente
Santos, Carlota
Román-Busto, Jorge
Magalhães, Manuel
Regional–temporal analysis
Issue date2013
PublisherCambridge University Press
JournalTwin Research and Human Genetics
CitationFuster, V., Santos, C., Roman-Busto, J., & Magalhaes, M. (2013). A Study of Multiple Deliveries in Portugal: Indications of an Iberian Peninsula Pattern. Twin Research and Human Genetics, 16(5), 998-1007. doi: 10.1017/thg.2013.56
Abstract(s)Information on multiple deliveries with regard to Portugal is scarce. Based on data provided by the Portuguese Institute of Statistics (INE), the rates for double and triple deliveries were calculated since 1930. The results obtained show for twins a uniform temporal pattern up to the 1970s. At this time rates decreased, but later they gradually recovered, reaching their maximum level in 2010. For triplets, the highest rates occurred between 1999 and 2002. For the period 1988-2011, the rates of multiple deliveries were related to a set of variables recorded in the INE database on live births. Significant differences (p < .001) between simple and multiple deliveries were obtained for maternal age, parity and marital status. Considering the year when the delivery occurred, significant differences (p < .001) persisted for maternal age regardless of the year. For the type of mating, significance was consistently found since the year 2002 (either by using the marital or the cohabitation criteria), and for parity since 2003. With regard to territorial variation, throughout seven periods between 1930 and 2011, the rates among the 20 administrative Portuguese territories, including the two insular districts of Açores and Madeira, were mostly stable for twinning rates, with a minimum level in 1970-1989. Regarding triplets, the greatest inter-district variation was found after 1980. The results of the Portuguese study on multiple deliveries are interpreted in the context of the Iberian Peninsula based on findings reported for Spain.
Description"First published online 13 August 2013"
AccessOpen access
Appears in Collections:CECS - Artigos em revistas internacionais / Articles in international journals
GHP/CITCEM - Artigos em Revistas Internacionais

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