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Related Experiment Videos

Association between the rates of multiple maternities.

Johan Fellman1, Aldur W Eriksson

  • 1Folkhälsan Institute of Genetics, Population Genetics Unit, Helsinki, Finland. johan.fellman@shh.fi

Twin Research : the Official Journal of the International Society for Twin Studies
|November 6, 2004
PubMed
Summary

Multiple maternity rates in Sweden decreased until 1960, then increased due to reproductive technologies. Regional variations in twinning rates were significant, influenced by time-dependent factors.

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Area of Science:

  • Demography
  • Epidemiology
  • Reproductive Health

Background:

  • Multiple maternity rates in Sweden exhibited a decreasing trend from 1751 to 1960.
  • Post-1960, rates of multiple maternities significantly increased, primarily attributed to assisted reproductive technologies like ovulation stimulants.
  • Regional variations in twinning rates were observed, with maternal age not fully explaining these differences.

Purpose of the Study:

  • To analyze the association and correlation between multiple maternity rates in Sweden.
  • To investigate the influence of time-dependent factors and regional variations on twinning and triplet rates.
  • To understand the relationship between twinning and triplet rates after accounting for confounding variables.

Main Methods:

  • Correlation analysis was employed, considering monotonic relationships between variables.

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  • Hellin's law was used to transform triplet and quadruplet rates to a comparable scale with twinning rates.
  • Partial correlation coefficients and cross-sectional regional data analyses were conducted to assess regional variations and time-dependent factors.

    • Main Results:

    • Time trends for multiple maternities were similar across Sweden.
    • Strong regional variations were found in both ordinary and partial correlation coefficients.
    • After eliminating time-dependent factors, a moderate correlation was observed between twinning and triplet rates.

    Conclusions:

    • Regional differences in multiple maternity rates are influenced by time-dependent factors with significant regional variability.
    • Assisted reproductive technologies have markedly impacted multiple maternity rates since 1960.
    • The correlation between twinning and triplet rates is moderate once confounding time-dependent factors are controlled for.