“…14,51,85 The frequency, severity, and recovery from concussion are influenced by demographic (eg, age (< 18 years old), 53,54 sex (female), 53,86–88 concussion history, 58,89–93 and premorbid factors including migraine, 94 depression, 95 anxiety, 96 learning disability, 78 hyperactivity disorders, 97 sleep disturbance, 55,98 and overall symptom burden. 99 In addition, factors related to symptom severity have been associated with prolonged recovery including post-traumatic amnesia (PTA), 9,100 loss of consciousness (LOC), 101 on-field dizziness, 102 post-traumatic migraine, 11,103,104 acute symptom burden, 69,77,105,106 and neurocognitive impairment.…”