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Social class and human twinning.

B Bønnelykke1

  • 1Cytogenetics Laboratory, Aarhus Psychiatric Hospital, Denmark.

Journal of Biosocial Science
|July 1, 1990
PubMed
Summary

Social class impacts dizygotic (DZ) twinning rates, with fewer DZ twins born to lower social classes. Monozygotic (MZ) twinning was unaffected by social factors in this Danish study.

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Area of Science:

  • Reproductive epidemiology
  • Human genetics
  • Sociology of reproduction

Background:

  • Twinning rates exhibit variations influenced by demographic and socioeconomic factors.
  • Understanding these influences is crucial for reproductive health research.
  • Previous studies have suggested links between social status and dizygotic twinning.

Purpose of the Study:

  • To investigate the association between social factors and human twinning.
  • To differentiate the effects of social class on monozygotic (MZ) versus dizygotic (DZ) twinning.
  • To control for maternal age and parity in the analysis.

Main Methods:

  • Comparative study design utilizing data from Danish parents of twins and singleton births (1984-1985).
  • Postal questionnaire for data collection on sociodemographic and other relevant factors.
  • Classification of twins into MZ and DZ types using the similarity method.

Main Results:

  • A significant trend of lower dizygotic (DZ) twinning rates observed in lower social classes.
  • No significant association found between social class and monozygotic (MZ) twinning.
  • Results remained consistent after controlling for maternal age and parity.

Conclusions:

  • Social class appears to be a significant factor influencing dizygotic (DZ) twinning.
  • Monzygotic (MZ) twinning rates do not seem to be affected by social class.
  • Further research is warranted to elucidate the mechanisms behind social class disparities in DZ twinning.

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