[Infant mortality in Chile: the great descent]

Area of Science:

• Public Health
• Demography
• Epidemiology

Background:

• Chile observed a substantial decline in infant mortality rates between 1960 and 1994.
• This period, termed the "great descent," saw rates fall from 120 to 12 per 1,000 live births.
• Understanding the drivers of this decline is crucial for global child survival strategies.

Purpose of the Study:

• To review the key factors contributing to the significant reduction in infant mortality in Chile.
• To analyze the impact of demographic, socioeconomic, and healthcare changes on infant mortality trends.
• To investigate causes of death and mortality differentials across various risk groups.

Main Methods:

• Review of existing research and updated data on infant mortality in Chile.
• Analysis of demographic and socioeconomic changes, including fertility decline.
• Comparison of neonatal and postneonatal mortality rates by cause between 1980 and 1994.
• Examination of mortality differentials based on maternal age, birth order, gestational age, residence, and maternal education.

Main Results:

• Fertility decline, initiated in the mid-1960s, contributed an estimated 30% to infant mortality reduction between 1972 and 1982.
• Infant mortality continued to decrease despite economic crises in 1975 and 1982.
• Analysis revealed specific causes of death for neonatal and postneonatal periods and identified high-risk groups for infant mortality.

Conclusions:

• The "great descent" in Chilean infant mortality was driven by a combination of factors, including reduced high-risk births and healthcare improvements.
• Socioeconomic and demographic transitions played a significant role in improving child survival.
• Understanding mortality differentials is vital for targeted public health interventions to further reduce infant deaths.