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Coital frequency and twinning

  • B. Bønnelykke (a1), J. Olsen (a2) and J. Nielsen (a1)

In a comparative study to enquire whether parents of twins, especially of dizygotic twins, have a higher frequency of sexual intercourse than parents of singleton infants, data on sociodemographic status, coital frequency and other variables were collected using a postal questionnaire. Parents of all twins born alive in Denmark in 1984 or 1985 were included as cases and a random sample of parents of singleton infants born in the same period were controls. No evidence of any difference in coital frequency was found between parents of twins (neither dizygotic twins nor monozygotic) and parents of singleton infants.

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Allen, G. & Schachter, J. (1970) Do conception delays explain some changes in twinning rates? Acta Genet, med. Gemell. 19, 30.
Bishop, Y. M. M., Feinberg, S. E. & Holland, P. W. (1975) Discrete Multivariate Analysis: Theory and Practice. MIT Press, Cambridge, Massachusetts.
Bønnelykke, B., Hauge, M., Holm, N., Kristoffersen, K. & Gurtler, H. (1990) Evaluation of zygosity diagnosis in twin pairs below age seven by means of a mailed questionnaire (in press).
Bulmer, M. G. (1959) The effect of parental age, parity and duration of marriage on the twinning rate. Ann. hum. Genet. 23, 454.
Bulmer, M. G. (1970) The Biology of Twinning in Man. Clarendon Press, Oxford.
James, W. H. (1971) Cycle day of insemination, coital rate, and sex ratio. Lancet, i, 112.
James, W. H. (1972) Coital rates and dizygotic twinning. J. biosoc. Sci. 4, 101.
James, W. H. (1980) Time of fertilisation and sex of infants. Lancet, i, 1124.
James, W. H. (1981) Dizygotic twinning marital stage and status and coital rates. Ann. hum. Biol. 8, 371.
James, W. H. (1983) Decline in coital rates with spouses' ages and duration of marriage. J. biosoc. Sci. 15, 83.
James, W. H. (1984) Coitus-induced ovulation and its implications for estimates of some reproductive parameters. Acta Genet, med. Gemell. 33, 547.
Jeanneret, O. & Macmahon, B. (1962) Secular changes in rates of multiple births in the US. Am. J. hum. Genet. 14, 410.
Kleinbaum, D. G., Kupper, L. L. & Morgenstern, H. (1982) Epidemiologic Research. Van Nostrand Reinhold, New York.
Mantel, N. & Haenszel, W. (1959) Statistical aspects of the analysis of data from retrospective studies of disease. J. natn. Cancer Inst. 22, 719.
Nylander, P. P. S. (1981) The factors that influence twinning rates. Acta Genet, med. Gemell. 30, 189.
Thomson, B. & Illsley, R. (1969) Family growth in Aberdeen. J. biosoc. Sci. 1, 23.
Wyshak, G. & White, C. (1969) Fertility of twins and parents of twins. Hum. Biol. 41, 66.
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Journal of Biosocial Science
  • ISSN: 0021-9320
  • EISSN: 1469-7599
  • URL: /core/journals/journal-of-biosocial-science
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