Head injury assessment (HIA) number, propensity and proportion to tackler as a result of various types of head contact
| HIAs to tackler | Propensity (95% CI), HIAs/1000 events | Percentage of HIAs to the tackler (95% CI) | |
| Head to head | 84 | 11.30 (9.13 to 14.00) | 78 (69 to 85) |
| Head to elbow | 13 | 6.35 (3.69 to 10.94) | 100 |
| Head to knee | 19 | 3.09 (1.97 to 4.85) | 61 (44 to 76) |
| Head to hip | 71 | 1.72 (1.36 to 2.17) | 97 (91 to 99) |
| Head to shoulder | 46 | 1.69 (1.27 to 2.26) | 65 (54 to 75) |
| Head to arm | 20 | 1.37 (0.88 to 2.12) | 36 (25 to 50) |
| Head to lower leg | 18 | 1.36 (0.86 to 2.17) | 82 (61 to 93) |
| Head to ground | 1 | 0.73 (0.10 to 5.20) | 17 (3 to 56) |
| Head to upper body | 42 | 0.46 (0.34 to 0.62) | 79 (67 to 88) |
| Head to upper leg | 15 | 0.43 (0.26 to 0.72) | 83 (61 to 94) |
| Whiplash | 3 | – | 27 (10 to 57) |
| Head to equipment | 0 | – | |
| Head to hand (fist) | 3 | – | 75.0 (30 to 95) |