Head injury assessment (HIA) number, propensity and proportion to tackler for various tackle characteristics
| Tackle characteristics | Events per match | HIA number | Propensity (95% CI), HIAs/1000 events | Incidence (95% CI), HIAs/1000 hours | Percentage of HIAs to tackler (95% CI) |
| Tackle type | |||||
| Active shoulder | 39 | 177 | 2.98 (2.57 to 3.46) | 2.92 (2.52 to 3.38) | 77 (70 to 82) |
| Passive shoulder | 61 | 134 | 1.44 (1.22 to 1.71) | 2.21 (1.87 to 2.62) | 84 (77 to 90) |
| Smother tackle | 57 | 120 | 1.40 (1.17 to 1.68) | 1.98 (1.65 to 2.37) | 64 (55 to 72) |
| Tap tackle | 1 | 5 | 3.66 (1.53 to 8.80) | 0.08 (0.03 to 0.20) | 100.0 |
| Lift (illegal) | 0.05 | 1 | 6.60 (0.93 to 46.83) | 0.02 (0.00 to 0.12) | 0.0 |
| No arms | 0 | 5 | 0.0 | ||
| High tackle | 0.05 | 18 | 237.47 (149.61 to 376.91) | 0.30 (0.19 to 0.47) | 11.1 (3 to 33) |
| Use of elbow/forearm | 0 | 1 | 0.02 (0.00 to 0.12) | 0.0 | |
| Tackle direction | |||||
| Front | 61 | 247 | 2.67 (2.36 to 3.02) | 4.07 (3.60 to 4.61) | 67 (61 to 73) |
| On angle | 41 | 101 | 1.62 (1.33 to 1.97) | 1.67 (1.37 to 2.02) | 75 (66 to 83) |
| Side-on | 42 | 84 | 1.32 (1.06 to 1.63) | 1.39 (1.12 to 1.72) | 81 (71 to 88) |
| Back | 14 | 32 | 1.54 (1.09 to 2.18) | 0.53 (0.37 to 0.75) | 78 (61 to 89) |
| Accelerating player | |||||
| Tackler | 17 | 116 | 4.47 (3.73 to 5.37) | 1.91 (1.59 to 2.29) | 64 (55 to 72) |
| Ball carrier | 93 | 221 | 1.56 (1.37 to 1.79) | 3.64 (3.19 to 4.16) | 74 (68 to 80) |
| Both | 31 | 90 | 1.91 (1.55 to 2.35) | 1.48 (1.21 to 1.82) | 77 (68 to 85) |
| Neither | 17 | 37 | 1.47 (1.06 to 2.02) | 0.61 (0.44 to 0.84) | 73 (57 to 85) |
| Number of tacklers | |||||
| 1 | 81 | 246 | 2.00 (1.77 to 2.27) | 4.06 (3.5 to 4.60) | 72 (66 to 77) |
| 2 | 74 | 201 | 1.80 (1.57 to 2.06) | 3.31 (2.89 to 3.81) | 73 (66 to 78) |
| 3 or more | 3 | 17 | 3.35 (2.08 to 5.38) | 0.28 (0.17 to 0.45) | 71 (47 to 87) |