Multiple Trigger Points for Quantifying Heat-Health Impacts: New Evidence from a Hot Climate

Area of Science:

• Environmental Health
• Public Health
• Epidemiology

Background:

• Extreme heat poses a significant public health challenge.
• Lack of comparable studies and inconsistent temperature thresholds hinder effective heat-health strategies.
• Adverse heat-health events require comprehensive mitigation approaches.

Purpose of the Study:

• To quantitatively link temperature with mortality and morbidity in Maricopa County, Arizona.
• To focus on associations during the summer season.
• To identify temperature "trigger points" for public health interventions.

Main Methods:

• Utilized Poisson regression models to analyze daily temperature-health associations.
• Controlled for temporal confounders in the analysis.
• Identified minimum risk, increasing risk, and excess risk temperatures.

Main Results:

• High temperatures showed significant associations with all-cause, cardiovascular, and heat-related mortality.
• Heat-related hospitalizations and emergency visits were strongly linked to high temperatures, exceeding mortality counts.
• Observed substantial variations (up to 22°C) in temperature trigger points across different health outcomes.

Conclusions:

• Considering multiple health events and diagnoses reveals diverse intervention trigger points.
• A comprehensive approach to identifying heat thresholds is necessary.
• Providing varied heat trigger points can enhance public health responses to escalating heat challenges.