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Related Experiment Videos

Changing trends in twinning

R Goswami1, H K Goswami

  • 1Department of Genetics, University Campus, Bhopal, India.

Acta Geneticae Medicae Et Gemellologiae
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

Twinning rates in India have shifted, with a decrease in dizygotic (fraternal) twins and an increase in monozygotic (identical) twins. This change is linked to declining maternal age due to family planning, affecting different-sex twin births.

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Area of Science:

  • Reproductive biology
  • Demography
  • Human genetics

Background:

  • Twinning rates exhibit complex demographic trends.
  • Previous studies indicated a rise in dizygotic twinning rates from 1960-1982.
  • Understanding twinning rate fluctuations is crucial for reproductive health research.

Purpose of the Study:

  • To analyze trends in dizygotic and monozygotic twinning rates in India between 1982 and 1991.
  • To investigate the influence of maternal age and family planning on twinning patterns.
  • To explain the observed reversal of previous twinning rate trends.

Main Methods:

  • Analysis of birth statistics from 13,887,943 births across 11 Indian states.
  • Examination of maternal age data in relation to twinning types (dizygotic vs. monozygotic).

Related Experiment Videos

  • Application of Weinberg's differential method to assess twinning rates.

    • Main Results:

    • A decline in the dizygotic twinning rate and a rise in the monozygotic twinning rate were observed from 1982 to 1991.
    • Maternal age above 35 was associated with a higher frequency of different-sex twins.
    • Reduced mean maternal age, linked to family planning, correlated with a fall in different-sex twin births.

    Conclusions:

    • The observed decline in dizygotic twinning rates is likely an artifact of decreasing mean maternal age.
    • Family planning measures influencing maternal age impact the rates of different-sex twin births.
    • The study explains the reversal of twinning trends by considering the shift in maternal reproductive age.