Extreme Heat, Birth Outcomes, and Socioeconomic Heterogeneity

Area of Science:

• Environmental Health
• Perinatal Epidemiology
• Sociology of Health

Background:

• Extreme heat events pose a growing threat to public health.
• Birth outcomes are critical indicators of population health and future well-being.
• Socioeconomic status (SES) is a known determinant of health disparities.

Purpose of the Study:

• To examine the impact of extreme heat exposure during gestation on adverse birth outcomes.
• To investigate whether the effects of extreme heat on birth outcomes differ by family socioeconomic status (SES).

Main Methods:

• Linked individual-level birth data (approx. 4 million newborns, Spanish provincial capitals, 1990-2016) with precise meteorological data.
• Assessed birth outcomes including preterm birth, low birth weight, and very low birth weight.
• Categorized socioeconomic status (SES) based on parents' highest occupational level.

Main Results:

• Exposure to extreme heat in early gestation was associated with an increased incidence of adverse birth outcomes.
• The negative impact of extreme heat was disproportionately concentrated among children from low socioeconomic backgrounds.
• Findings indicate that extreme temperatures may widen existing socioeconomic inequalities in health.

Conclusions:

• Extreme heat during pregnancy poses a significant risk to infant health, with a greater burden on vulnerable, low-SES populations.
• The study underscores the potential for climate change to exacerbate socioeconomic disparities in health.
• Urgent public health strategies are needed to mitigate the impact of extreme heat on birth outcomes, especially for disadvantaged groups.