A brief summary of current research.
Saunders, LL Selassie, AW, Hill, EG, Horner, MD, Nicholas, JS, Lackland, DT, and Corrigan, JD (2009). Archives of Physical Medicine and Rehabilitation, Vol. 90 (11), pp 1853-1859.
The hazard of repeat TBI for people with pre-existing epilepsy/seizure disorder was 2.3 times the hazard for those without. Pre-existing drug/alcohol problem was not associated with repeat TBI. Other variables significantly associated with repeat TBI were having a prior TBI, being insured under Medicaid, and having no insurance.