Traumatic Brain Injury and High Combat Exposure Pose Additive Risk for Specific Chronic Health Conditions in Veterans...

Area of Science:

• Veterans' health
• Epidemiology
• Public health

Background:

• Traumatic brain injury (TBI) and combat exposure are prevalent among U.S. military Veterans.
• These risk factors are independently linked to chronic health conditions.
• The combined influence and interaction of TBI and combat exposure on long-term health outcomes remain underexplored.

Purpose of the Study:

• To investigate the interaction between TBI and high combat exposure in exacerbating the risk for chronic health conditions in Veterans.
• To determine if co-occurring TBI and combat exposure lead to worse health outcomes than either factor alone.

Main Methods:

• Utilized data from 156,242 U.S. Veterans in the VA Million Veteran Program (MVP).
• Assessed TBI via self-report and combat exposure using the Combat Experiences Scale.
• Employed multivariate logistic regressions and relative excess risk due to interaction (RERI) to analyze associations and interactions.

Main Results:

• Veterans with TBI history showed significantly higher odds of reporting psychiatric, cardiovascular, and neurological conditions.
• High combat exposure was associated with increased odds of psychiatric, cardiovascular, and neurological conditions.
• Significant interactions between TBI and high combat exposure were found for several psychiatric and neurological conditions, indicating amplified risk.

Conclusions:

• Both TBI and high combat exposure independently increase the risk for various chronic health conditions in Veterans.
• The combined effect of TBI and high combat exposure significantly amplifies the risk for certain psychiatric and neurological conditions.
• Evaluating combined risk factors is crucial for identifying Veterans at higher risk for chronic health conditions and informing targeted interventions.