Table 2

History of the injury

mTBI athletesNumberPercentage
Cause of injury
 Hits5492
 Falls58
Occurence of injury
 Game4678
 Training1322
Admission Cantu grade
 Severe (3)4678
 Moderate (2)915
 Mild (1)23
 Unknown23
Admission AAN grade
 31424
 24373
 123
LOC
 Yes1627
 No4373
Antero-amnesia
 No3254
 ≤1 min814
 ≥1 min1932
Retro-amnesia
 No4881
 ≤1 min58
 ≥1 min610
Initial symptoms
 Headache4780
 Fatigue4068
 Pressure in head3153
 Sonophobia/photophobia3051
 Neck pain3051
 Difficulty concentrating/remembering2949
 Balance problems2441
 Drowsiness2339
 Nausea—vomitting2237
 Trouble falling asleep2136
 Visual problems1932
Duration of symptoms
 Mean duration ±SEM9.88±1.56 days
 Max/min duration 56 days/30 min
  • AAN, American Academy of Neurology; LOC, Loss of consciousness; mTBI, mild traumatic brain injury.