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Table 4 Comparisons of potential predictor variables for those who did and did not receive a diagnosis of concussion following the use of the CIR

From: A video review of multiple concussion signs in National Rugby League match play

Predictor variable Concussion diagnosis (n = 60) No concussion diagnosis (n = 96) p value
  Observed sign: N (%) present  
Unresponsiveness or possible loss of consciousness* 24 (40) 26 (27) .111
Gait ataxia 35 (58) 52 (54) .484
Vacant stare* 45 (75) 48 (50) .009
Clutch or shake head* 38 (63) 72 (75) .105
Slow to get up 60 (100) 93 (97) .285
Seizure* 3 (5) 0 (0) .055
  Injury characteristic: N (%) present  
Anticipated the oncoming hit* 53 (88) 73 (76) .063
Low tackle height 11 (18) 18 (19) .888
  Athlete characteristics: mean (SD)  
Age (years) 26.2 (3.6) 26.6 (3.6) .487
Injured athlete height (cm) 186.2 (5.1) 186.2 (5.3) .975
Injured athlete mass (kg) 101.3 (8.5) 100.8 (9.0) .694
Defenders involved in the tackle (number)* 2.1 (0.9) 2.3 (0.8) .078
Primary tackler height (cm) 186.9 (5.1) 186.1 (5.9) .351
Primary tackler mass (kg) 102.5 (9.0) 102.5 (10.9) .965
  1. *Potential predictor variables considered for inclusion in the logistic regression model (p < .20)