Table 2.
Meningoccocal disease in Australia by age group, serogroup and year, adjusted for untyped cases
| Age group (years) | Serogroup | Adjusted* total cases and average annual incidence rate/100 000 population | IRR 2010–2012 vs. 2000–2002 | ||||
|---|---|---|---|---|---|---|---|
| 2000–2002 | 2010–2012 | ||||||
| Cases (raw) | Rate | Cases (raw) | Rate | IRR | 95% CI | ||
| <1 | C | 22 (17) | 2·93 | 3 (3) | 0·34 | 0·11 | 0·034–0·38 |
| Non-C | 204 (161) | 27·15 | 97 (89) | 10·96 | 0·40 | 0·31–0·51 | |
| 1–4 | C | 95 (70) | 3·10 | 0 (0) | 0 | 0·0 | — |
| Non-C | 278 (204) | 9·07 | 126 (107) | 3·59 | 0·40 | 0·32–0·49 | |
| 5–14 | C | 120 (79) | 1·49 | 3 (2) | 0·04 | 0·02 | 0·01–0·08 |
| Non-C | 180 (118) | 2·24 | 68 (53) | 0·82 | 0·37 | 0·28–0·48 | |
| 15–24 | C | 282 (225) | 3·57 | 6 (6) | 0·07 | 0·02 | 0·01–0·04 |
| Non-C | 309 (247) | 3·91 | 171 (162) | 1·86 | 0·47 | 0·39–0·57 | |
| 25–39 | C | 116 (79) | 0·89 | 5 (5) | 0·03 | 0·04 | 0·02–0·10 |
| Non-C | 106 (72) | 0·81 | 48 (44) | 0·33 | 0·41 | 0·29–0·58 | |
| ⩾40 | C | 114 (86) | 0·46 | 21 (19) | 0·07 | 0·15 | 0·09–0·24 |
| Non-C | 172 (130) | 0·69 | 144 (135) | 0·47 | 0·68 | 0·54–0·85 | |
| 1–24 | C | 497 (374) | 2·61 | 9 (8) | 0·04 | 0·02 | 0·01–0·032 |
| Non-C | 767 (569) | 4·03 | 365 (322) | 1·73 | 0·43 | 0·38–0·49 | |
| ⩾25 | C | 230 (165) | 0·60 | 26 (24) | 0·06 | 0·10 | 0·06–0·14 |
| Non-C | 278 (202) | 0·73 | 192 (179) | 0·43 | 0·58 | 0·48–0·70 | |
| All ages | C | 749 (556) | 1·30 | 38 (35) | 0·06 | 0·04 | 0·02–0·06 |
| Non-C | 1249 (932) | 2·16 | 654 (590) | 0·97 | 0·45 | 0·41–0·50 | |
IRR, Incidence rate ratio; CI, confidence interval.
* Adjusted for untyped meningococcal disease cases.