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[Decrease in twin births in the german federal republic (author's transl)]

J Krüger, P Propping

    Deutsche Medizinische Wochenschrift (1946)
    |March 26, 1976
    PubMed
    Summary
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    The decline in twin births is primarily due to fewer dizygotic twins (DZ). Factors like reduced maternal age, parity, and contraceptive use contribute to this trend, alongside potential impacts of ovulation inhibitors.

    Area of Science:

    • Reproductive biology
    • Epidemiology
    • Human genetics

    Context:

    • Twin birth rates have shown a declining trend.
    • Dizygotic twinning is a key factor in overall twin birth frequency.
    • Historical birth data from Baden-Würtemberg (1955-1972) provides a basis for analysis.

    Purpose:

    • To investigate the reasons behind the decreasing frequency of twin births.
    • To determine the specific contribution of dizygotic (DZ) twins to this decline.
    • To explore the roles of maternal age, parity, contraceptive practices, and ovulation inhibitors.

    Summary:

    • The study identifies a decrease in dizygotic (DZ) twins as the sole driver of reduced twin birth rates.
    • While changes in maternal age and parity account for some of the decrease, they are not the primary cause.

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  • Widespread contraceptive use is hypothesized to reduce the proportion of women with genetically higher fertility, thus lowering DZ twin occurrences.
  • The potential negative influence of ovulation inhibitors on double ovulation rates is also considered as a contributing factor.

    • Impact:

    • Provides insights into the multifactorial nature of twinning rates.
    • Highlights the potential impact of societal changes, such as contraceptive use, on reproductive outcomes.
    • Informs future research on factors influencing dizygotic twinning and reproductive health.