Secular pattern showing incidence rates for the two most common bacteraemias
| 1974–79 | 1980–85 | 1986–91 | 1992–97 | |
|---|---|---|---|---|
| Streptococcus pneumoniae | ||||
| Main group | ||||
| Events | 5 | 13 | 8 | 16 |
| Patient-years × 1000 | 5.2 | 7.8 | 10.0 | 10.3 |
| Incidence | 1.0 | 1.7 | 0.8 | 1.6 |
| 95% CI | (0.4 to 2.9) | (0.8 to 4.2) | (0.4 to 1.8) | (1.0 to 2.7) |
| Cohort group | ||||
| Events | 14 | 17 | 4 | 4 |
| Patient-years × 1000 | 0.7 | 1.5 | 1.4 | 1.2 |
| Incidence | 19.9 | 11.5 | 2.9 | 3.5 |
| 95% CI | (9.5 to 48.8) | (6.9 to 20.4) | (1.1 to 10.2) | (1.3 to 12.3) |
| Salmonella spp | ||||
| Main group | ||||
| Events | 0 | 3 | 13 | 27 |
| Patient-years × 1000 | 5.2 | 7.8 | 10.0 | 10.3 |
| Incidence | 0.0 | 0.4 | 1.3 | 2.6 |
| 95% CI | — | (0.1 to 1.9) | (0.8 to 2.4) | (1.8 to 3.9) |
| Cohort group | ||||
| Events | 6 | 11 | 8 | 2 |
| Patient-years × 1000 | 0.7 | 1.5 | 1.4 | 1.2 |
| Incidence | 8.5 | 7.4 | 5.7 | 1.7 |
| 95% CI | (3.9 to 22.2) | (4.2 to 14.3) | (3.0 to 12.7) | (0.4 to 17.2) |
CI, confidence intervals.