Prevalence of Traumatic Brain Injury in the General Adult Population of the USA: A Meta-Analysis.

Background: Traumatic brain injury (TBI) is a leading cause of death and disability worldwide. It has been estimated that 64-74 million individuals experience TBI from all causes each year. Due to these variations in reporting TBI prevalence in the general population, we decided to perform a meta-analysis of published studies to better understand the prevalence of TBI in the general adult population of the USA which can help health decision-makers in determining general policies to reduce TBI cases and their costs and burden on the healthcare system.

Methods: Our meta-analysis was performed using the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) checklist. The study protocol was registered with PROSPERO (CRD42024534598). A comprehensive literature search of PubMed from the National Library of Medicine and Google Scholar was performed from database inception to April 2024. Sixteen studies that evaluated the US general population met our inclusion criteria. A meta-analysis using a random-effects model was performed to estimate the prevalence of TBI in the general adult population of the USA.

Results: The total sample consisted of 27,491 individuals, of whom 4,453 reported a lifetime history of TBI with loss of consciousness (LOC) (18.2%, 95% CI 14.4-22.7%). Some studies did not report relevant information based on gender, but based on available data, among males, 1,843 individuals out of 8,854 reported a lifetime history of TBI with LOC (20.8%). Among females, 1,363 individuals out of 11,943 reported a lifetime history of TBI with LOC (11.4%). The odds of sustaining TBI in males were higher than in females with moderate heterogeneity between studies (OR = 2.09, 95% CI 1.85-2.36, p < 0.01, I2 = 40%).

Conclusion: The prevalence of TBI in the US general population is 18.2%, making it a major public health concern. In addition, males were more than twice as likely as females to sustain TBI with LOC. Considering the irreparable long-term adverse effects of TBI on survivors, their families, and the healthcare system, prevention strategies can facilitate substantial reductions in TBI-related permanent disabilities and medical care costs.