Archives of gynecology

, Volume 233, Issue 4, pp 263–266 | Cite as

A study of the sex ratio of first-born According to the mother's month of birth

  • T. Miura
  • K. Nonaka
  • M. Shimura
  • I. Nakamura
Original Papers


The male-to-female sex ratio at birth of the first-born babies delivered in Japan to mothers aged 25 years or less was investigated in two groups: a hospital group and a questionnaire group. The sex ratio fluctuated according to their mother's month of birth. Between 1924 and 1928, the sex ratio of the offspring of the mothers born in March-May in both groups was significantly higher than that of the other mothers. We speculate about the relationship between the sex ratio at birth and the mother's month of birth.

Key words

Epidemiology Month of birth Sex ratio 


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  1. Allan TM (1959) AB0 blood groups and sex ratio at birth. Br Med J 1: 553–554Google Scholar
  2. Drew JS, London WT, Lustbader ED, Hesser JE, Blumberg BS (1978) Hepatitis B virus and the sex ratio of offspring. Science 201: 687–692PubMedGoogle Scholar
  3. Drew J, London WT, Blumberg BS, Serjeantson S (1982) Hepatitis B virus and sex ratio on Kar Kar island. Hum Biol 54: 123–135PubMedGoogle Scholar
  4. Erickson JD (1976) The secondary sex ratio in the United States 1969–71: Association with race, parental ages, birth order, paternal education and legitimacy. Ann Hum Genet 40: 205–212PubMedGoogle Scholar
  5. Griffiths PD, Ronalds CJ, Heath RB (1980) A prospective study of influenza infections during pregnancy. J Epidemiol Community Health 34: 124–128PubMedGoogle Scholar
  6. Guerrero R (1974) Association of the type and time of insemination within the menstrual cycle with the human sex ratio at birth. N Engl J Med 291: 1056–1059PubMedGoogle Scholar
  7. Harlap S (1979) Gender of infants conceived on different days of the menstrual cycle. N Engl J Med 300: 1445–1449PubMedGoogle Scholar
  8. Hesser JE, Economidou J, Blumberg BS (1975) Hepatitis B surface antigen (Australia antigen) in parents and sex ratio of offspring in a Greek population. Hum Biol 47: 415–425PubMedGoogle Scholar
  9. Hesser JE, Blumberg BS, Drew JS (1976) Hepatitis B surface antigen, fertility and sex ratio: implications for health planning. Hum Biol 48: 73–81PubMedGoogle Scholar
  10. Huntington E (1938) Season of birth; its relation to human abilities. Wiley & Sons, New YorkGoogle Scholar
  11. James WH (1971) Coital rate, sex ratio and parental age. Lancet 1: 1294Google Scholar
  12. James WH (1975) Sex ratio and the sex composition of the existing sibs. Ann Hum Genet 38: 371–378PubMedGoogle Scholar
  13. James WH (1980) Gonadotrophin and the human secondary sex ratio. Br Med J 281: 711–712PubMedGoogle Scholar
  14. Miura T, Shimura M (1980a) The relation between seasonal birth variation and the season of mothers' birth. Arch Gynecol 229: 115–122Google Scholar
  15. Miura T, Shimura M (1980b) Epidemic seasonal infertility. A hypothesis for the cause of seasonal variation of births. Int J Biometeorol 24: 91–95Google Scholar
  16. Moran PAP, Novitski E, Novitski C (1969) Paternal age and the secondary sex ratio in humans. Ann Hum Genet 32: 315–316PubMedGoogle Scholar
  17. Novitski E, Kimball AW (1958) Birth order, parental ages, and sex of offspring. Am J Hum Genet 10: 268–275PubMedGoogle Scholar
  18. Plank SJ, Buncher CR (1975) Maternal AB0 groups and sex ratio of live births. Hum Hered 25: 226–233PubMedGoogle Scholar
  19. Renkonen KO, Mäkelä O, Lehtovaara R (1962) Factors affecting the human sex ratio. Nature 194: 308–309Google Scholar
  20. Sugiura K (1928) Upon the sex of newly-born in Japan. (In Japanese) J Kinki Gynecol Soc 11: 1189–1217Google Scholar
  21. Takahashi E (1952) Notes on Japanese birth statistics. Hum Biol 24: 44–52PubMedGoogle Scholar
  22. Teitelbaum MS, Mantel M, Stark CR (1971) Limited dependence of the human sex ratio on birth order and parental ages. Am J Hum Genet 23: 271–280PubMedGoogle Scholar

Copyright information

© J. F. Bergmann Verlag GmbH & Co KG 1983

Authors and Affiliations

  • T. Miura
    • 1
  • K. Nonaka
    • 1
  • M. Shimura
    • 1
  • I. Nakamura
    • 1
  1. 1.Dept. of HygieneTeikyo University School of MedicineTokyo 173Japan

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