Serogroup versus death, IMD cases notified in Hunter New England District, January 1998–July 2016
| Serogroup | No. cases | Crude CFR | Crude OR for death | Adjusted OR for death (by age category) |
| B | 190 | 5.8% | Reference | Reference |
| W135 | 13 | 38.5% | 10.2 (P<0.001, 95% CI 2.8 to 36.3) | 4.1 (P=0.06, 95% CI 0.9 to 17.8) |
| Y | 12 | 16.7% | 3.3 (P=0.16, 95% CI 0.6 to 16.7) | 1.0 (P=0.98, 95% CI 0.2 to 6.4) |
| C | 60 | 5.1% | 0.9 (P=0.83, 95% CI 0.2 to 3.2) | 0.7 (P=0.61, 95% CI 0.2 to 2.7) |
CFR, case-fatality ratio; IMD, invasive meningococcal disease.