Table 2.

Demographic Summary of the Experienced Breacher and Control Cohorts

	Breacher (N = 20)	Control (N = 14)
Age, years	39.65 (26–54)	38.85 (27–53)
Ethnicity	• Caucasian = 17 • American Indian = 1 • Asian = 1 • Other = 1	• Caucasian = 12 • African American = 1 • Asian = 1
Handedness	Right = 18; left = 2	Right = 12; left = 2
Service	• Army = 13 • Navy = 1 • Law enforcement = 6	• Army = 10 • Law enforcement = 4
Duration of service	16.8 (8–27)	13.8 (5–24)
Post-Traumatic Checklist–Military (PCL-M)	20.7 ± 4.7 (17–30) with 0 subjects >44 (PTSD cutoff)	25.6 ± 7.1 (17–40) with 0 subjects >44 (PTSD cutoff)
Concussion	Yes = 13; no = 7	Yes = 6; no = 8
Total blast exposures	• 4628 (100–34,800)	3 (0–35)
Breaches in past year	• >400 = 3 • 200–399 = 5 • 100–199 = 3 • 40–99 = 1 • 10–39 = 2 • 1–9 = 4	• None = 14

PTSD, post-traumatic stress disorder.