Table 2

Frequency of visible signs (VS) among players with diagnosed concussion in the 2013–2014 and 2014–2015 regular seasons

Concussion with positive signConcussion with negative signNo concussion with positive signNo concussion with negative signTotal
SignTrue positiveFalse negativeFalse positiveTrue negative
Loss of consciousness/motionless1318912755969
Slow to get up following a hit to the head8012271057969
Incoordination/balance problems3516777690969
Blank or vacant look41982765969
Clutching of head after a hit16186105662969
Visible facial injury in combination10192151616969
  • The total number of signs (969) includes concussion diagnoses without VS (861 events with VS and 108 diagnosed concussions with no observed VS).