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Updated: Sep 24, 2025
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Twinning rates in Chennai, India - A cross-sectional study
Anuradha J Kuppan1, Victor Samuel2, R Mahesh1
1Department of Pediatric Dentistry, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Chennai Tamil Nadu, India.
Journal of Family Medicine and Primary Care
|May 6, 2022
Summary
Chennai
Area of Science:
- Reproductive Health
- Demography
- Epidemiology
Background:
- Chennai, a major Indian metropolis, experiences significant rural-urban migration and lifestyle changes.
- Understanding twinning trends is crucial for public health and demographic analysis.
Purpose of the Study:
- To analyze the twinning rate in Chennai.
- To examine twinning distribution across city zones.
- To investigate the correlation between maternal age and twin zygosity.
Main Methods:
- Population-based study of twin births in Chennai (2010-2012).
- Data collected from Chennai Corporation and Health Department registers.
- Analysis of 1371 resident twin pairs using Epiinfo software.
Main Results:
- Observed twinning rate of 19.3 per 1000 births.
- Monozygotic (MZ) twins: 22.6%; Dizygotic (DZ) twins: 77.3% (1:3 ratio).
- Peak twinning rates observed in maternal age groups 25-35 years; most births were first order.
Conclusions:
- Chennai's twinning rate is notably high compared to historical Tamil Nadu data.
- Weinberg's Differential Rule for zygosity determination showed discrepancies.
- Zygosity proportions, maternal age, and parity relationships align with existing literature.
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