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Direct measurement of Recent Hutterite Fertility

Research Project

Project/Area Number 04670316
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Hygiene
Research InstitutionTeikyo University School of Medicine

Principal Investigator

NONAKA Koichi  Teikyo Univ.School of Medicine, Department of hygiene, Lecturer, 医学部, 講師 (80142446)

Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
KeywordsHutterites / Fertile population / Natural fertility / Twinning / Seasonal variation / Birth interval / Maternal age / Popoulation database / 出生力
Research Abstract

The main purpose of this study was to confirm an estimated recent decline in the fertility of the Hutterites, using a firsthand source of data. The church book that has been kept by a preacher of the Dariusleut sect of the Hutterites enabled us to construct a computerized database on their vital events such as births, marriages, baptisms and deaths. Data in the database has been returned to the Hutterites for their benefit. The recent decline in Hutterite fertility was verified in the present study : the age-specific fertility rate reduced by 36% on average from the 1951-1955 to 1981-1985. The reduction was most evident at higher maternal age, especially at 30 years of age and older. Probability of having a live birth at a given age, however, still peaked at around the age of 20 years, which suggests that the fecundity of recent Hutterite women has not been changed despite the apparent fertility decline. A separate cohort analysis on the database revealed that the reduced number of children born to a recent woman was not fully explained by a factor of the observed delay in the age at marriage. The database also provided us with the information of the twinning rate. The rate fluctuated by year period as well as by season : May-July was a season of a low twinning rate, but only in the period before 1965. Environmental factors are supposed to have been involved in the etiology of twinning, probably through the incidence of dizygotic twins. Twin births were accompanied with a prolonged preceding birth interval, especially at the ages of 30-34 years, which suggested the occurrence of twinning at a relatively younger maternal age may indicate a lower, not higher, fecundity of women. Several biological aspects of human reproduction under a contraception-free condition have been and will be clarified from this database.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Nonaka K,Miura T,Peter K: "Low twinning rate and seasonal effects on twinning in a fertile population." International Journal of Biometeorology. 37. 145-150 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nonaka K,Miura T,Peter K: "Recent fertility decline in Dariusleut Hutterites:An extension of Eaton and Mayer's Hutterite fertility study." Human Biology. 66. 419-428 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Sato T,Nonaka K,Miura T,Peter K: "Trends in cohort fertility of the Dariusleut Hutterite population." Human Biology. 66. 429-439 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nonaka K, Miura T, Peter K: "Low twinning rate and seasonal effects on twinning in a fertile population, the Hutterites." International Journal of Biometeorology. 37. 145-150 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nonaka K, Miura T, Peter K: "Recent fertility decline in Dariusleut Hutterites : An extension of Eaton and Mayr's Hutterite fertility study." Human Biology. 66. 419-428 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Sato T, Nonaka K, Miura T, Peter K: "Trends in cohort fertility of the Dariusleut Hutterite population." Human Biology. 66. 429-439 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nonaka K,Miura T,Peter K: "Low Twinning rate and seasonal effects on twinning in a fertile population." International Journal of Biometeorology. 37. 145-150 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Nonaka K,Miura T,Peter K: "Recent fertility desline in Dariusleut Hutterites.An extenscon of Eaton and Mayer's Hutterite fertility study." Human Biology. 66. 419-428 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Sato T,Nonaka K,Miura T,Peter K: "Trends in cohort fertility of the Dariuslent Hutterite population." Human Biology. 66. 429-439 (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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