Age related incidence of infections among 311 patients in the cohort group and 3509 patients in the main study patients given as standardised infections rates (SIR)
| Age group (years) | |||||
|---|---|---|---|---|---|
| 0–2 | 3–5 | 6–9 | 10–19 | 20+ | |
| Cohort group | |||||
| Events | 30 | 26 | 17 | 13 | 4 |
| Patient-years × 1000 | 0.87 | 0.81 | 1.01 | 1.94 | 0.24 |
| Rate | 34.5 | 32.1 | 16.9 | 6.7 | 17.0 |
| 95% CI | (23.1 to 53.9) | (20.9 to 51.8) | (10.5 to 29.0) | (3.7 to 13.5) | (6.6 to 57.8) |
| SIR | 1.9 | 1.7 | 0.9 | 0.4 | 0.9 |
| 95% CI | (1.3 to 2.9) | (1.1 to 2.8) | (0.6 to 1.6) | (0.2 to 0.7) | (0.4 to 3.1) |
| Main group | |||||
| Events | 21 | 30 | 21 | 13 | 39 |
| Patient-years × 1000 | 1.07 | 2.31 | 3.53 | 9.69 | 16.62 |
| Rate | 19.6 | 13.0 | 6.0 | 1.3 | 2.4 |
| 95% CI | (11.9 to 34.7) | (8.8 to 20.0) | (3.9 to 9.6) | (0.8 to 2.5) | (1.7 to 3.3) |
| SIR | 5.3 | 3.5 | 1.6 | 0.4 | 0.6 |
| 95% CI | (3.2 to 9.4) | (2.4 to 5.4) | (1.1 to 2.6) | (0.02 to 0.7) | (0.5 to 0.9) |
| Both patient groups | |||||
| Events | 51 | 56 | 38 | 26 | 43 |
| Patient-years × 1000 | 1.94 | 3.12 | 4.54 | 11.63 | 16.85 |
| Rate | 26.3 | 17.9 | 8.4 | 2.2 | 2.6 |
| 95% CI | (19.2 to 36.9) | (13.4 to 24.5) | (6.1 to 11.9) | (1.5 to 3.5) | (1.9 to 3.5) |
| SIR | 4.7 | 3.2 | 1.5 | 0.4 | 0.5 |
| 95% CI | (3.4 to 6.6) | (2.4 to 5.4) | (1.1 to 2.1) | (0.3 to 0.6) | (0.3 to 0.6) |
CI, confidence intervals.