Figure 2. Postconcussive Symptoms and Suicidal Ideation in the Collaborative Care and Usual Care Groups by Adolescent Report.

Postconcussive symptoms (A) were assessed with the Health Behavior Inventory, a 20-item questionnaire that assesses postconcussive symptoms on a 4-point scale, ranging from never to often, and yields total scores in cognitive and somatic domains (score range, 0-60 points, with higher scores indicating more symptoms). Suicidal ideation (B) was assessed according to participants’ response to the final item on the Patient Health Questionnaire–9. Responses to this item were dichotomized as any suicidal ideation vs none.