Condition-specific mortality risk can explain differences in COVID-19 case fatality ratios around the globe

Area of Science:

• Epidemiology
• Public Health
• Infectious Diseases

Background:

• COVID-19 mortality varies globally, influenced by factors like age and pre-existing health conditions.
• Understanding condition-specific risks is crucial for managing the pandemic.
• Italy experienced significant COVID-19 related mortality, necessitating detailed risk assessment.

Purpose of the Study:

• To estimate the condition-specific case fatality ratio (CFR) for various subpopulations in Italy.
• To analyze how pre-existing health conditions influence COVID-19 mortality risk.
• To contribute to explaining global variations in COVID-19 CFR.

Main Methods:

• Utilized data on pre-existing health conditions of deceased patients positive for SARS-CoV-2 in Italy.
• Estimated total deaths categorized by pre-existing health conditions.
• Calculated conditional CFR based on the number of comorbidities prior to SARS-CoV-2 infection.

Main Results:

• A conditional CFR of 0.6% was observed for individuals with no pre-existing pathology.
• The conditional CFR increased to 13.9% for individuals with one or more pre-existing health conditions.
• Demonstrated a clear correlation between comorbidity burden and COVID-19 mortality risk.

Conclusions:

• Condition-specific mortality risks are vital for understanding COVID-19 pandemic dynamics.
• Pre-existing health conditions are significant determinants of COVID-19 fatality.
• Accurate postmortem examination is needed to differentiate cause of death and improve understanding of COVID-19 mortality and pathogenicity.