TABLE 1—

Positive Responses for Each TBI-4 Question: 1 Western and 1 Eastern US Metropolitan Veterans Affairs Hospital, May 2010-October 2011

Question	(1) Have you ever been hospitalized or treated in an emergency room following a head or neck injury?	(2) Have you ever been knocked out or unconscious following an accident or injury?	(3) Have you ever injured your head or neck in a car accident or from some other moving vehicle accident?	(4) Have you ever injured your head or neck in a fight or a fall?	Any 1 of 4
Positive response	249	317	216	251	400
Percentage positive (95% CI)	37 (33, 40)	47 (43, 51)	32 (28, 36)	37 (33, 41)	59 (55, 63)

Note. CI = confidence interval; TBI-4 = traumatic brain injury-4. The sample size was n = 678.