Table 1.

Subject demographics (n = 1,097).

	TBI-4 screen
	Positive (n = 468)	Negative (n = 629)	p-Value
Mean age	47.8 (±12.9)	48.2 (±13.6)	0.68
Gender			0.0001
Male	94.4% (442)	87.6% (551)
Female	5.6% (26)	12.4% (78)
Marital status			0.20
Married	30.8% (144)	35.5% (223)
Divorced/separated/widowed	45.5% (213)	40.7% (256)
Single	22.9% (107)	23.1% (145)
Missing/unknown	0.9% (4)	0.8% (5)
Race/ethnicity			0.002
Caucasian	76.9% (360)	68.0% (428)
African-American	10.0% (47)	17.2% (108)
Hispanic	0.6% (3)	0.5% (3)
Other	1.9% (9)	3.0% (19)
Missing	10.5% (49)	11.3% (71)
Period of service			0.37
Vietnam Era	41.2% (193)	38.2% (240)
Post-Vietnam	21.4% (100)	21.0% (132)
Persian Gulf War	32.7% (153)	33.9% (213)
Other	4.7% (22)	7.0% (44)
Eligibility			0.69
Non-service connected	34.2% (160)	34.5% (217)
Non-service connected, pension	5.8% (27)	4.13% (26)
Service connected <50%	20.3% (95)	22.3% (140)
Service connected 50–100%	39.3% (184)	38.5% (242)
Other	0.4% (2)	0.6% (4)