The primary goal of this study is to provide clinicians with a brief, patient self-administer instrument yielding a single composite score that reliably correlates with objective findings on standardized neurocognitive assessment for concussion.

This Phase 2 study, Concussion in Motor Vehicle Accidents - The Concussion Identification Index (CIDI), focuses on the psychometric properties of the relationship between acute injury events, i.e. head impact, loss of consciousness (LOC), and post-traumatic amnesia (PTA), commonly reported post-crash signs and symptoms, and neurocognitive outcomes.

Cohort 1 is the validation group and will be used to confirm the optimal cut-off score of the Concussion Identification Index (CIDI) with the score on the ImPACT.

Cohort 2 is the cross-validation group.

Inclusion Criteria:

• Patients injured in a motor-vehicle related accident

Exclusion Criteria:

• Age younger than 10 years old or older than 60 years of age
• Patients who presented for initial evaluation of injuries greater than 90 days after MVA occurred
• Patients who declined to take a computerized neurocognitive test battery
• Patients who were not fluent in either English or Spanish

Cohort 1 - Validation Group: Consecutive patients who presented for care between November 1, 2013 and December 31, 2014 at the MVA Center for Rehabilitation, a public health clinic in Springfield, MA which provides specialized outpatient auto accident treatment and rehabilitation

Cohort 2 - Cross Validation Group: Consecutive patients who presented for care between January 1, 2015 and June 30, 2016 at the MVA Center for Rehabilitation, a public health clinic in Springfield, MA