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Secular trends of twinning rate in Sweden

Published online by Cambridge University Press:  31 July 2008

Ulf Högberg  and
Stig Wall
Ulf Högberg
Affiliation:
Department of Obstetrics and GynaecologyUmeå University, Sweden
Stig Wall
Affiliation:
Department of Epidemiology and Health Care Research, Umeå University, Sweden
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Summary

The change in parity and maternal age in Sweden accounts for the decline in the twinning rate from the 19th century to the middle of the 20th century. The later decline in twinning rate cannot be explained by changes in maternal age and parity. Fecundity appears to be higher in mothers of twins than in other mothers.

Type
Research Article
Information
Journal of Biosocial Science , Volume 24 , Issue 4 , October 1992 , pp. 487 - 496
Copyright
Copyright © Cambridge University Press 1992

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