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Table 1 Propensity for HIAs for tacklers and ball carriers as a function of body position

From: A Case–Control Study of Tackle-Based Head Injury Assessment (HIA) Risk Factors in the National Rugby League

  HIA events Propensity (HIAs per 1000 events) 95% CI Incidence (matches per HIA)
HIAs as a function of tackler body position
Tackler HIAs
For upright tackler 160 1.38 1.19–1.62 2.51
For bent tackler 86 0.71 0.58–0.88 4.67
For falling/diving tackler 36 0.72 0.52–1.00 11.17
Total Tackler HIAs 282 0.99 0.88–1.11  
Ball carrier HIAs
For upright tackler 135 1.17 0.99–1.38 2.98
For bent tackler 11 0.09 0.05–0.16 36.55
For falling/diving tackler 15 0.3 0.18–0.50 26.80
Total Ball Carrier HIAs 161 0.56 0.48–0.66  
HIAs as a function of ball carrier body position
Tackler HIAs
For upright ball carrier 244 1.63 1.44–1.85 1.65
For bent ball carrier 8 0.10 0.05–0.20 50.25
For falling/diving ball carrier 29 0.53 0.37–0.76 13.86
Total ball carrier HIAs 281 0.99 0.88–1.11  
Ball carrier HIAs
For upright ball carrier 121 0.81 0.68–0.97 3.32
For bent ball carrier 5 0.06 0.03–0.15 80.40
For falling/diving ball carrier 35 0.63 0.46–0.88 11.49
Total Ball Carrier HIAs 161 0.56 0.48–0.66  
  1. CI: confidence interval; HIA: head injury assessment