Frequency of documentation of trauma history elements and 95% confidence interval (* indicates one sided 97.5% confidence interval)
| Haddon matrix cell | Element | Completion frequency (%) |
|---|---|---|
| Pre-event/child | Previous medical history | 96 (93 to 98) |
| Precipitating event | 24 (19 to 30) | |
| Previous riding experience | 7 (4 to 10) | |
| Previous injury history | 4 (2 to 7) | |
| Risk taking behavior | 0 (0 to 0.01)* | |
| Conspicuity of child | 0 (0 to 0.01)* | |
| Pre-event/bicycle | Type of bicycle | 1 (0.2 to 3) |
| Bicycle condition | 0.4 (0 to 2) | |
| Conspicuity of bicycle | 0 (0 to 0.01)* | |
| Fit of bicycle to child | 0 (0 to 0.01)* | |
| Pre-event/environment | Exact address of incident | 23 (18 to 28) |
| Where child was biking | 4 (2 to 7) | |
| Street type | 1 (0 to 3) | |
| Condition of road/traffic | 0 (0 to 0.01)* | |
| Event/child | Child traumatic contact points | 81 (76 to 85) |
| Main body part impacted | 63 (57 to 69) | |
| Kinematics of child | 49 (43 to 55) | |
| Indication of protective device used | 23 (18 to 28) | |
| Crash type | 1 (0.5 to 4) | |
| Event/bicycle | Bicycle part impacted | 5 (2 to 8) |
| Bicycle speed | 1 (0 to 3) | |
| Event/environment | Indication of motor vehicle/object involvement | 58 (52 to 64) |
| Motor vehicle/object speed | 15 (11 to 19) | |
| Motor vehicle/object description | 1 (0.4 to 4) | |
| Surface landed on | 0 (0 to 0.01)* | |
| Post-event/child | Diagnosis | 89 (85 to 93) |
| Post-crash activity | 23 (18 to 29) | |
| Post-event/bicycle | Indication of damage to bicycle | 2 (1 to 5) |
| Description of damage | 0.4 (0 to 2) | |
| Post-event/environment | Indication of pre-hospital care | 82 (76 to 86) |
| Description of pre-hospital care | 27 (22 to 33) |