Many patients with mild TBI are treated in the ED and discharged. Moderate-to-severe TBI only accounts for about 20% of all TBI. However ,the incidence of severe TBI is over three times higher for men than for women and more frequently affects patients of lower socioeconomic status. Falls are the leading cause of TBI in adults over age 65, followed by motor vehicle accidents and violence. Some 52,000 deaths occur each year as a result of TBI , and an estimated 5.3 million Americans (or 2 % of the population) are living with disabilities from TBI .