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Has fecundability been declining in recent years in developed countries?

Published online by Cambridge University Press:  31 July 2008

William H. James
William H. James
Affiliation:
Galton Laboratory, University College, London
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Summary

It is suggested that dizygotic twinning rates and fecundability are closely related and that the recent declines in dizygotic twinning rates may have been accompanied by declines in fecundability in developed societies. Records on twinning rates for many countries are readily accessible in national vital statistics; demographers may therefore find that changes in dizygotic twinning rates may be a useful monitor of changes in fecundability. The question arises whether this decline in fecundability has been responsible, to any appreciable extent, for the decline in birth rates experienced in recent years by developed countries.

Information

Type
Research Article
Information
Journal of Biosocial Science , Volume 13 , Issue 4 , October 1981 , pp. 419 - 424
Copyright
Copyright © Cambridge University Press 1981

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References

Bulmer, M.G. (1970) The Biology of Twinning in Man. Clarendon Press, Oxford.Google Scholar
Czeizel, A. & Acsadi, G. (1971) Demographic characteristics of multiple births in Hungary. Acta Genet. med. Gemell. 20, 301.CrossRefGoogle Scholar
Dougherty, R.C., Whitaker, M.J., Tang, S.-Y., Bottcher, R. & Keller, M. (1980) Sperm density and toxic substances: a potential key to environmental health hazards. In: The Chemistry of Environmental Agents as Human Health Hazards. Edited by McKinney, J. D.. Ann Arbor Science Publishers, Michigan.Google Scholar
Elwood, J.M. (1973) Changes in the twinning rate in Canada 1926–70. Br. J. prev. soc. Med. 27, 236.Google ScholarPubMed
Eriksson, A.W. (1973) Human twinning in and around the Aland Islands. Commentat. biol. 64, 1.Google Scholar
Hoogendoorn, D. (1973) Daling van het aantal meerlinggeboorten. Ned. Tijdschr. Geneesk. 117, 805.Google Scholar
James, W. H. (1972) Secular changes in dizygotic twinning rates. J. biosoc. Sci. 4, 427.CrossRefGoogle ScholarPubMed
James, W.H. (1973) Decline in dizygotic twinning. New Engl. J. Med. 289, 1204.Google ScholarPubMed
James, W.H. (1975a) The secular decline in dizygotic twinning rates in Italy. Acta Genet. med. Gemell. 24, 9.CrossRefGoogle ScholarPubMed
James, W.H. (1975b) The declines in dizygotic twinning rates and in birth rates. Ann. hum. Biol. 2, 81.CrossRefGoogle ScholarPubMed
James, W.H. (1980a) Time of fertilisation and sex of infants. Lancet, i, 1124.CrossRefGoogle Scholar
James, W.H. (1980b) Gonadotrophin and the human secondary sex ratio. Br. med. J. 2, 711.CrossRefGoogle Scholar
James, W.H. (1980c) Secular trend in reported sperm counts. Andrologia, 12, 381.CrossRefGoogle ScholarPubMed
James, W.H. (1980d) Secular changes in twinning rates in England & Wales. Ann. hum. Biol. 7, 485.CrossRefGoogle ScholarPubMed
James, W.H. (1981) Dizygotic twinning, marital stage and status and coital rates. Ann. hum. Biol. (in press).CrossRefGoogle ScholarPubMed
Jeanneret, O. & MacMahon, B. (1962) Secular changes in rates of multiple births in the United States. Am. J. hum. Genet. 14, 410.Google ScholarPubMed
Krüger, J. & Propping, P. (1976) Ruckgang der Zwillingsgeburten in Deutschland. Dt. med. Wschr. 101, 475.CrossRefGoogle Scholar
Laing, L.M. (1980) Declining fertility in a religious isolate: the Hutterite population of Alberta, Canada, 1951–71.Hum. Biol. 52, 288.Google Scholar
MacLeod, J. (1951) Semen quality in 1000 men of known fertility and 800 cases of infertile marriage. Pert. Steril. 2, 115.CrossRefGoogle ScholarPubMed
Rola-Janicki, A. (1974) Multiple births in Poland 1949–71. In: Multiple Pregnancy and Twin Care. Edited by Parisi, P.. Acta Genet. med. Gemell. 22, Suppl.Google Scholar
Sandahl, B. (1974) A study of seasonal and secular trends of stillbirths and spontaneous abortion in Sweden. Acta obstet. gynec. scand. 53, 251.CrossRefGoogle ScholarPubMed
Sheps, M.C. & Perrin, E.B. (1964) The distribution of birth intervals under a class of stochastic fertility models. Popul Stud. 17, 321.CrossRefGoogle Scholar
Thompson, B. & Aitken-Swan, J. (1973) Pregnancy outcome and fertility control in Aberdeen. Br. J.prev. soc. Med. 27, 137.Google ScholarPubMed
Westoff, C.F. (1974) Coital frequency and contraception. Fam. Plann. Perspect. 6, 136.CrossRefGoogle ScholarPubMed