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[Multiple pregnancies in Denmark 1980-1994]

T Westergaard1, J Wohlfahrt, P Aaby

  • 1Afdeling for Epidemiologisk Forskning, Statens Serum Institut, København, .

Ugeskrift for Laeger
|October 23, 1998
PubMed
Summary
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Multiple pregnancy rates significantly increased in Denmark, particularly among older first-time mothers, from 1989-1994. This rise, unexplained by maternal age or parity, is attributed to fertility treatments.

Area of Science:

  • Reproductive Medicine
  • Epidemiology
  • Public Health

Context:

  • National birth registers provide data on childbirths to Danish-born women.
  • Multiple pregnancy rates have shown significant national increases.
  • Trends are analyzed in relation to maternal age and parity.

Purpose:

  • To investigate trends in national multiple pregnancy rates.
  • To determine if changes in maternal age and parity explain the observed trends.
  • To identify potential causes for unexplained increases in multiple births.

Summary:

  • National incidence of multiple pregnancies rose 1.7-fold between 1980-1994, with a sharp increase from 1989-1994.
  • The rise was concentrated in primiparous women aged 30 years and older.

Related Experiment Videos

  • Twinning rates increased 2.7-fold and triplet rates 9.1-fold in this demographic.
  • Multiple births' proportion among infant deaths in this group rose from 11.5% to 26.9%.

    • Impact:

    • The study highlights a significant increase in multiple pregnancies, especially in older primiparous women during the 1990s.
    • Findings suggest fertility-enhancing treatments as the likely cause, independent of maternal age or parity shifts.
    • This has implications for maternal and infant health outcomes and healthcare resource allocation.