Table 3.
Incidence rates of traumatic head injuries (ICD-9 850–854) per 1000 with 95% confidence intervalsa within parentheses, by severity of injury and residence. Number and percentage of injured patients by injury severity category in each of the two geographical areas (N = 550), and the total population at risk (N = 85,746)
| Reykjavik area
|
Rural areas
|
|||
|---|---|---|---|---|
| Severity of injury | Incidence | Number Injured (%) | Incidence | Number Injured (%) |
| Minimal | 6.87 (6.2, 7.7) | 325 (79.5) | 1.93 (1.5, 2.4) | 74 (52.5) |
| Mild | 1.52 (1.2, 1.9) | 72 (17.6) | 1.48 (1.1, 1.9) | 57 (40.4) |
| Moderate/Severe | 0.23 (0.1, 0.4) | 11 (2.7) | 0.18 (0.1, 0.4) | 7 (5.0) |
| Fatal | 0.021 (0.0, 0.1) | 1 (0.2) | 0.080 (0.0, 0.2) | 3 (2.1) |
| Total | 8.64 (7.9, 9.5) | 409 (100.0) | 3.67 (3.1, 4.3) | 141 (100.0) |
| Population | 47,327 | 38,419 | ||
a
Note: Confidence intervals were calculated with the Wilson score procedure (Agresti and Coull 1998).