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Decrease in twinning rate in a hospital in Tokyo during World War II.

I Nakamura1, K Nonaka, T Miura

  • 1Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan.

Acta Geneticae Medicae Et Gemellologiae
|January 1, 1990
PubMed
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Malnutrition during World War II significantly impacted twinning rates in Tokyo. The study found a notable decrease in twin births, particularly during severe food shortages and bombing in 1945.

Area of Science:

  • Reproductive epidemiology
  • Demographic history
  • Public health during wartime

Background:

  • World War II and postwar periods in Tokyo were marked by severe malnutrition.
  • Understanding the impact of nutritional status on reproductive outcomes is crucial.

Purpose of the Study:

  • To investigate changes in the twinning rate in Tokyo during World War II and postwar years.
  • To correlate observed changes with periods of malnutrition.

Main Methods:

  • Analysis of approximately 80,000 delivery records from a Tokyo hospital spanning 1924-1986.
  • Examination of twinning rates and mean birth weights during specific wartime and postwar intervals.

Main Results:

  • Twinning rate declined from 1.47% (1920s) to 0.81% (1980s).

Related Experiment Videos

  • A significant drop to 0.70% was observed during 1943-1947, with a low of 0.33% in 1945.
  • Mean birth weight of singleton babies decreased during 1943-1947, indicating worsening nutritional conditions.

    • Conclusions:

    • Malnutrition during wartime significantly suppressed the twinning rate in Tokyo.
    • The study highlights the sensitivity of twinning rates to severe environmental stressors like famine and conflict.