Table 4.
Incidence rates of traumatic head injuries (ICD-9 850–854) per 1000 with 95% confidence intervals, by residence, gender, and age. Number and percentage of injured patients by gender and age in each of the two geographical areas (N = 550)
| Boys
|
Girls
|
Overall | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Age in years | 0–4 | 5–9 | 10–14 | 15–19 | 0–4 | 5–9 | 10–14 | 15–19 | |
| Reykjavik area | |||||||||
| Incidence | 16.27 | 8.63 | 8.64 | 4.50 | 11.45 | 6.85 | 6.04 | 5.17 | 8.64 |
| 95% CIa | 13.5, 19.6 | 6.5, 11.4 | 6.6, 11.3 | 3.1, 6.6 | 9.1, 14.4 | 5.0, 9.4 | 4.4, 8.4 | 3.6, 7.4 | 7.9, 9.5 |
| Number injured | 108 (26.4%) | 48 (11.7%) | 52 (12.7%) | 26 (6.4%) | 73 (17.8%) | 38 (9.3%) | 35 (8.6%) | 29 (7.1%) | 409 (100.0%) |
| Rural areas | |||||||||
| Incidence | 4.35 | 2.92 | 3.86 | 4.52 | 5.13 | 4.28 | 2.72 | 1.51 | 3.67 |
| 95% CI | 2.9, 6.6 | 1.7, 4.9 | 2.5, 6.0 | 3.0, 6.8 | 3.5, 7.6 | 2.7, 6.7 | 1.6, 4.7 | 0.7, 3.1 | 3.1, 4.3 |
| Number injured | 22 (15.6%) | 14 (9.9%) | 20 (14.2%) | 22 (15.6%) | 24 (17.0%) | 19 (13.5%) | 13 (9.2%) | 7 (5.0%) | 141 (100.0%) |
a
Note: Confidence intervals (CI) were calculated with the Wilson score procedure (Agresti and Coull 1998).