Frequency and percentage of descriptors for concussive event (C) and non-injury (NI) event during precontact and contact
| Precontact | C (n) | Per cent | NI (n) | Per cent | Contact | C (n) | Per cent | NI (n) | Per cent |
|---|---|---|---|---|---|---|---|---|---|
| Body position of tackler | Type of tackle | ||||||||
| Upright | 1 | 20 | 3 | 16 | Arm | 1 | 20 | 7 | 37 |
| Medium | 1 | 20 | 5 | 26 | Collision | 1 | 20 | 1 | 5 |
| Low | 1 | 20 | 2 | 11 | Jersey | 0 | 0 | 1 | 5 |
| Upright to medium | 1 | 20 | 2 | 11 | Shoulder (dive) | 0 | 0 | 1 | 5 |
| Upright to low | 0 | 0 | 6 | 32 | Shoulder (opposite leading leg) | 1 | 20 | 4 | 21 |
| Medium to upright | 0 | 0 | 0 | 0 | Shoulder (same leading leg) | 2 | 40 | 5 | 26 |
| Medium to low | 1 | 20 | 1 | 5 | Smother tackle | 0 | 0 | 0 | 0 |
| Low to upright | 0 | 0 | 0 | 0 | Tap tackle | 0 | 0 | 0 | 0 |
| Low to medium | 0 | 0 | 0 | 0 | |||||
| Tackler stance | Direction of Tackle | ||||||||
| Flat-footed | 1 | 20 | 1 | 5 | Front | 4 | 80 | 8 | 42 |
| Back-foot | 0 | 0 | 1 | 5 | Side | 1 | 0 | 7 | 37 |
| Split forward | 2 | 40 | 10 | 53 | Oblique | 0 | 0 | 2 | 11 |
| No stance | 2 | 40 | 7 | 37 | Behind | 0 | 20 | 2 | 11 |
| Head position of tackler | Body region of tackler struck | ||||||||
| Down | 1 | 20 | 5 | 26 | Legs | 0 | 0 | 0 | 0 |
| Tracking | 1 | 20 | 7 | 37 | Mid-torso | 0 | 0 | 0 | 0 |
| Up and forward | 3 | 60 | 5 | 26 | Shoulder/arm | 2 | 40 | 19 | 100 |
| Away | 0 | 0 | 0 | 0 | Head and neck | 3 | 60 | 0 | 0 |
| Arm position of tackler | Body region of ball-carrier struck | ||||||||
| Elbows bent with hands raised | 0 | 0 | 1 | 5 | Legs | 1 | 20 | 7 | 37 |
| Hands above shoulders | 3 | 60 | 4 | 21 | Mid-torso | 3 | 60 | 5 | 26 |
| Hands dropped | 2 | 40 | 13 | 68 | Shoulder/arm | 1 | 20 | 7 | 37 |
| Head and neck | 0 | 0 | 0 | 0 | |||||
| Speed of tackler | Ball-carrier fend | ||||||||
| Slow | 3 | 60 | 8 | 42 | Absent | 4 | 80 | 8 | 42 |
| Moderate | 0 | 0 | 6 | 32 | Moderate | 1 | 20 | 9 | 47 |
| Fast | 2 | 40 | 5 | 26 | Strong | 0 | 0 | 2 | 11 |
| Speed of ball-carrier | Tackle sequence | ||||||||
| Slow | 0 | 0 | 0 | 0 | One-on-one | 3 | 60 | 13 | 68 |
| Moderate | 1 | 20 | 7 | 37 | Sequential | 1 | 20 | 5 | 26 |
| Fast | 4 | 80 | 12 | 63 | Simultaneous | 1 | 20 | 1 | 5 |
| Attacking sequential | 0 | 0 | 0 | 0 | |||||
| Direction of movement of tackler | Impact force | ||||||||
| Forwards | 4 | 80 | 11 | 58 | Low | 1 | 20 | 3 | 16 |
| Backwards | 0 | 0 | 1 | 5 | Medium | 2 | 40 | 12 | 63 |
| Lateral | 1 | 20 | 7 | 37 | High | 2 | 40 | 4 | 21 |
| Interpersonal distance between ball-carrier and tackler | |||||||||
| Near | 5 | 100 | 11 | 58 | |||||
| Moderate | 0 | 0 | 8 | 42 | |||||
| Distant | 0 | 0 | 0 | 0 | |||||
| Direction of movement of ball-carrier | |||||||||
| Straight | 2 | 40 | 11 | 58 | |||||
| Side-step | 1 | 20 | 1 | 5 | |||||
| Arcing run | 1 | 20 | 0 | 0 | |||||
| Lateral run | 0 | 0 | 3 | 16 | |||||
| Diagonal run | 1 | 20 | 4 | 21 | |||||
| Orientation of tackler in relation to ball-carrier | |||||||||
| In-front | 4 | 80 | 9 | 47 | |||||
| Side | 1 | 20 | 6 | 32 | |||||
| Oblique | 0 | 0 | 3 | 16 | |||||
| Behind | 0 | 0 | 1 | 5 | |||||
| Ball-carrier visual awareness | |||||||||
| Absent | 1 | 20 | 2 | 11 | |||||
| Apparent | 4 | 80 | 16 | 84 | |||||
| Unsure | 0 | 0 | 1 | 5 | |||||
| Attacking support | |||||||||
| Distant | 0 | 0 | 1 | 5 | |||||
| Near | 3 | 60 | 8 | 42 | |||||
| Immediate | 2 | 40 | 10 | 53 | |||||
| Defensive support | |||||||||
| Distant | 0 | 0 | 1 | 5 | |||||
| Near | 5 | 100 | 6 | 63 | |||||
| Immediate | 0 | 0 | 12 | 32 | |||||