Fig. 4
From: Evaluating the effectiveness of traumatic brain injury state laws among high school athletes
Estimated trends by TBI law language regarding requirements for education, 2005/06–2017/18. a Incident concussion rates-both coaches and parents/guardians; b recurrent concussion rates-both coaches and parents/guardians; c incident concussion rates-either coaches or parents/guardians; d recurrent concussion rates-either coaches or parents/guardians