Can social vulnerability indices predict county trauma fatality rates?

Area of Science:

• Epidemiology
• Geographic Information Systems (GIS)
• Public Health

Background:

• Social vulnerability indices (e.g., SoVI, SVI, DCI) assess community resilience based on socioeconomic and population factors.
• These indices can potentially identify populations at higher risk following injuries.
• The study aimed to determine the correlation between social vulnerability indices and injury fatality rates in the US.

Purpose of the Study:

• To evaluate the association between three distinct social vulnerability indices and county-level injury fatality rates in the United States.
• To identify which index, if any, demonstrates the strongest correlation with overall injury mortality.
• To explore the geographic distribution and spatial patterns of social vulnerability and injury fatalities.

Main Methods:

• Utilized three social vulnerability indices: Hazards & Vulnerability Research Institute's Social Vulnerability Index (SoVI), CDC's Social Vulnerability Index (SVI), and Economic Innovation Group's Distressed Community Index (DCI).
• Analyzed age-adjusted, county-level death rates for overall, firearm, and motor vehicle collision fatalities per 100,000 population.
• Employed linear regression to assess associations and bivariate choropleth mapping to visualize geographic variations and spatial autocorrelation.

Main Results:

• Across 3,137 US counties, all three indices showed a significant association with increased overall, firearm, and motor vehicle collision fatality rates.
• The Distressed Community Index (DCI) exhibited the best model fit and diagnostic performance for overall injury fatality.
• Significant geographic variations and spatial autocorrelation were observed for SoVI, DCI, and injury fatality rates at the county level.

Conclusions:

• Higher social vulnerability, as measured by SoVI, SVI, and DCI, is consistently associated with higher injury fatality rates.
• These social vulnerability indices offer valuable insights for epidemiologic and geographic assessments of injury-related mortality.
• Further research is recommended to ascertain if these indices surpass traditional socioeconomic measures in trauma research.