The primary aims of this study are to: 1) Establish the concurrent criterion-related validity of four traumatic brain injury (TBI) screening questions (TBI-4) using the Ohio State University TBI Identification Method (OSU TBI-ID) and 2) Establish the concurrent criterion-related validity of the TBI-4 with the addition of detailed information elicited by the four questions. Secondary aims include: 1) Determining if the addition of detailed information elicited by the TBI-4 results in increased specificity; 2) Determining whether the prevalence of traumatic brain injury (TBI) in this sample is concordant with previous research; and 3) Determining whether psychiatric outcomes are worse for veterans with traumatic brain injury (TBI) than those with no traumatic brain injury(TBI).

The primary aims of this study are to: 1) Establish the concurrent criterion-related validity of four traumatic brain injury (TBI) screening questions (TBI-4) using the Ohio State University TBI Identification Method (OSU TBI-ID) and 2) Establish the concurrent criterion-related validity of the TBI-4 with the addition of detailed information elicited by the four questions. Secondary aims include: 1) Determining if the addition of detailed information elicited by the TBI-4 results in increased specificity; 2) Determining whether the prevalence of traumatic brain injury (TBI) in this sample is concordant with previous research; and 3) Determining whether psychiatric outcomes are worse for veterans with traumatic brain injury (TBI) than those with no traumatic brain injury(TBI).

Primary Hypotheses:

Hypothesis 1a: The sensitivity and specificity of the TBI-4 will be significantly greater than 0.75 and 0.80, respectively.

Hypothesis 1b: The sensitivity and specificity of the TBI-4 with the addition of detailed information elicited by these questions (i.e., free text information entered by the clinician who administered the TBI-4) will be significantly greater than 0.75 and 0.80, respectively.

Secondary Hypotheses:

Hypothesis 1c: The specificity of the TBI-4 with the addition of detailed information elicited by these questions (i.e., free text information entered by the clinician who administered the TBI-4) will be significantly greater than that of the four questions alone.

Hypothesis 2: A significant difference in psychiatric outcomes (psychiatric hospitalizations, suicidal ideation, suicide attempts and completions, and mental health-related contacts) will be identified in those with a history of TBI versus those without a history of TBI as determined, first, by the TBI-4 and, second, by the OSU TBI-ID.

Hypothesis 3: The prevalence of Traumatic Brain Injury- Loss of Consciousness (TBI-LOC) in this population will be similar to that identified by Walker et al1 (31.7% of individuals will report 1 or more TBI-LOC).

Inclusion Criteria:

• Veteran must be at least 18 years of age.
• Veteran must have had a mental health intake no earlier than January of 2007.

Exclusion Criteria:

• Failure to provide informed consent as evidenced by inability to respond to the above stated questions.
• No Mental Health Intake note in the medical record.
• Presence of a Mental Health Intake note in the computer which does not contain the TBI-4

Indivduals with a history of completing the 4 Traumatic Brain Injury (TBI) screening questions during a mental health intake.