Understanding the sex ratio in India: a simulation approach

Area of Science:

• Demography
• Population Studies
• Sociology

Background:

• India exhibits a significantly masculine sex ratio, diverging from global trends.
• The drivers of India's skewed sex ratio remain debated, with hypotheses including under-enumeration, sex-selective births, and female mortality.
• Understanding these factors is crucial for population dynamics and gender equality research.

Purpose of the Study:

• To investigate the demographic factors contributing to India's highly masculine population sex ratio.
• To simulate population dynamics and assess the impact of mortality and sex ratio at birth.
• To resolve competing arguments regarding the underlying causes of the skewed sex ratio.

Main Methods:

• Utilized population projection models to simulate demographic trends.
• Incorporated varying levels of mortality at young ages and sex ratios at birth.
• Analyzed the long-term effects of these demographic parameters on the overall population sex ratio.

Main Results:

• Small, persistent differences in mortality rates during early life significantly impact the population sex ratio over time.
• A sex ratio at birth of 106 males per 100 females, combined with differential mortality, leads to a highly masculine population.
• The study provides quantitative evidence supporting the role of mortality and birth sex ratios.

Conclusions:

• Differential mortality patterns, even if small, play a substantial role in shaping India's masculine sex ratio.
• The sex ratio at birth is a critical determinant of the overall population sex ratio.
• These findings help clarify the complex demographic factors influencing India's sex ratio imbalances.