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Table 2 Data summary of video analysis from the 2014 National Rugby League season

From: Evidence of Concussion Signs in National Rugby League Match Play: a Video Review and Validation Study

Variable Total
Matches 201
Total number of tackles in the season 127,062
Average number of tackles per match 632.1
Average concussion interchange rule user per match 0.78
Concussion interchange rule (CIR) uses 167
 Returned to play 80
 No return to play 76
 Diagnosed concussions 60
 CIR, no return to play, and no concussion 16
  1. Note: video footage for 5 cases of the use of the CIR could not be located and therefore were not coded for concussion signs
  2. There were 6 CIR cases where return to play data is missing