Characteristics of the study group
| Variable | Mild HI n = 419 | Moderate HI n = 58 | Severe HI n = 49 | Control n = 45 |
|---|---|---|---|---|
| NA, not available. | ||||
| Gender: no. male (%) | 292 (69.7) | 47 (81) | 29 (59.2) | 27 (60) |
| Age at injury (years) | NA | |||
| Mean | 9.6 | 10.12 | 11.24 | |
| Median | 9.0 | 11.0 | 11.0 | |
| SD | 3.08 | 3.0 | 3.16 | |
| Range | 5–15 | 5–15 | 5–15 | |
| Age at time of follow-up (years) | ||||
| Mean | 12.31 | 12.81 | 13.76 | 11.91 |
| Median | 12.0 | 13.0 | 13.0 | 12.0 |
| SD | 3.52 | 3.46 | 3.52 | 2.89 |
| Range | 5–21 | 7–21 | 7–21 | 5–17 |
| Years between injury and follow-up | NA | |||
| Mean | 2.23 | 2.29 | 1.86 | |
| Median | 2.0 | 2.0 | 2.0 | |
| SD | 1.64 | 1.77 | 1.51 | |
| Range | 0–5 | 0–5 | 0–5 | |
| Ethnicity: no. white (%) | 397 (94.7%) | 58 (100%) | 47 (95.9%) | 44 (97.8%) |
| Mechanism of injury | NA | |||
| Fall (%) | 193 (46.1%) | 16 (27.6%) | 4 (8.2%) | |
| RTA pedestrian (%) | 48 (11.5%) | 15 (25.9%) | 29 (59.2%) | |
| RTA in vehicle (%) | 8 (1.9%) | 4 (6.9%) | 8 (16.3%) | |
| RTA cyclist (%) | 22 (5.3%) | 4 (6.9%) | 6 (12.2%) | |
| Fall from bicycle (%) | 44 (10.5%) | 3 (5.2%) | 0 | |
| Assault (%) | 20 (4.8%) | 4 (6.9%) | 0 | |
| Hit by object | 60 (14.3%) | 3 (5.2%) | 1 (2.%) | |
| Sport | 17 (4.1%) | 5 (8.6%) | 0 | |
| Other | 7 (1.7%) | 4 (6.9%) | 1 (2%) | |
| Total | 419 (100%) | 58 (100%) | 49 (100%) | |