High temperature effect on daily all-cause mortality in Tunis 2005-2007.

Area of Science:

• Environmental Health
• Epidemiology
• Climate Change and Health

Background:

• The health impacts of thermal stress are understudied in North Africa.
• This research focuses on the city of Tunis, a region with hot, dry summers and a lower-middle-income economy.

Purpose of the Study:

• To quantify the short-term effects of heat on total mortality in Tunis.
• To analyze the relationship between maximum temperature and daily mortality using time series analysis.

Main Methods:

• Analysis covered summer months (May-October) from 2005-2007.
• Segmented linear regression identified the temperature breakpoint for increased mortality.
• A Poisson Generalized Estimating Equations (GEE) model assessed heat's impact, adjusting for NO2, trend, and other factors.

Main Results:

• A temperature breakpoint of 31.5°C was identified.
• A 1°C increase above the breakpoint correlated with a 2.00% rise in daily mortality.
• Increased nitrogen dioxide (NO2) levels also showed a significant association with higher daily mortality.

Conclusions:

• Heat significantly impacts daily mortality in Tunis.
• This study provides crucial evidence on heat-health associations in a North African context.
• Findings underscore the need for public health interventions addressing heatwaves in similar regions.