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Multiple Births in Poland in 1949-1971

Published online by Cambridge University Press:  01 August 2014

A. Rola-Janicki
A. Rola-Janicki*
Affiliation:
Laboratory of Medical Statistics, Department of the Organization of Care for the Health of Mother and Child, National Research Institute for Mother and Child, Warsaw, Poland
*
Laboratory of Medical Statistics, National Research Institute for Mother and Child, ul. Kasprzaka 17, 01-211 Warszawa, Poland

Abstract

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A statistical analysis has been carried out on the frequency of twin and triplet births in Poland in the years 1949-1971.

These frequencies appear to be higher than expected on the basis of Hellin's rule, there being 1 twin birth in 87 single births and 1 triplet birth in 118 twin births.

The share of MZ vs. DZ twins having been assessed through Weinberg's method, an analysis is carried out on maternal age, parity, and urban vs. rural environment. It is concluded that the frequency of polyovulation increases with parity, whereas it becomes reduced with age on account of menopause effect already at age 40.

Type
5. The Twinning Phenomenon: Etiologic, Genetic, and Demographic Aspects
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 22 , supplement S1 , October 1972 , pp. 202 - 209
Copyright
Copyright © The International Society for Twin Studies 1972

References

1 The proof of this formulation was presented by the author of the present paper at the session of the Biostatistics Section of the Warsaw Branch of the Polish Society of Hygiene, on 21 November 1972.