Objective: The purpose of this study was to examine the base rates and longitudinal trajectory of ICD-10 postconcussion symptom status from 1-year to 2-years following injury in military service members with and without traumatic brain injury (TBI). Method: Participants were 57 U.S. military service members (Age: M = 31.7, SD = 8.2; 90.7% male) enrolled in a prospective 15-year longitudinal study. Participants included 42 service members who had sustained a mild-moderate TBI and 15 injured controls without TBI (i.e., Trauma Controls [TC]) who had completed the Neurobehavioral Symptom Inventory at 1-year (M = 12.7 months, SD = 2.4) and 2-years (M = 23.8 months, SD = 0.5) post-injury. Results: Compared to the TC group, a higher proportion of the mild-moderate TBI group met ICD-10 criteria for postconcussion syndrome (PCS) at 1-year (TBI = 47.6%, TC = 26.7%; p = .158) and 2-years (TBI = 57.1%; TC = 20.0%, p =...

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