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Demographic Parameters and Twinning: A Study in Catalonia, Spain

Published online by Cambridge University Press:  01 August 2014

J. Bertranpetit  and
A. Marin
J. Bertranpetit*
Affiliation:
Laboratory of Anthropology, School of Biology, University of Barcelona
A. Marin
Affiliation:
Genetics Unit, Department of Biology C-XV, University of Madrid, Spain
*
Laboratori d'Antropologia, Facultat de Biologia, Diagonal 645, 08028 Barcelona, Spain

Abstract

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Twinning rates for the years 1975-79 in Catalonia (Spain) are presented. Crude rates are very low: 7.62 per 1,000 maternities, the DZTR and the MZTR being 3.74 and 3.88 respectively. Standardized rates remain very low. Sex ratio among twin couples is also very low (0.49 male vs 0.51 female births). A multiple linear stepwise regression on the twinning rates shows MZ rates to be influenced by birth order and father's age, and the DZ rates by mother's age and birth order.

Keywords

Twinning rateFather's ageMother's ageBirth order
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 37 , Issue 2 , April 1988 , pp. 127 - 135
Copyright
Copyright © The International Society for Twin Studies 1988

References

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