Table 2.

Demographic information for the veteran study cohort. TBI diagnosis is based on confirmation according to Defense and Veterans Brain Injury Center (DVBIC) criteria of sustained injury to the head plus subsequent alteration of consciousness, and Repeatable Battery for Neuropsychological Testing (RBANS) scores of one standard deviation below the norms established for age and education of individuals in question. Non-TBI control classification is based on DVBIC confirmation of no sustained injury to the head and RBANS scores less than one standard deviation below the norms established. Most of the veteran TBI cases exhibit co-morbid post-traumatic stress disorder (PTSD). Thus, our non-TBI control cases are also matched for PTSD diagnosis. In this study, diagnosis of PSTD is based on a score of 50 or more in the PTSD Checklist – Civilian Version

	Control	TBI
Number of cases	7	5
Gender	57% male	80% male
Age (mean y ± SD)	30.1 ± 9.4	31.0 ± 7.1
Interval since last deployment (mean y ± SD)	2.8 ± 2.3	4.0 ± 3.8
Education (mean y ± SD)	13.3 ± 2.8	13.8 ± 1.5
Percentage of cases with co-morbid PTSD	85.7%	100%
Ethnicity composition
Black-African American	14.3%	40%
Hispanic	85.7%	60%