Table 1. Population-based incidence of invasive group A streptococcal disease, by age, Auckland, New Zealand, 2005–2006*.
| Population | Age group, y |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <1 |
<15 |
<50 |
>65 |
All ages |
||||||||||
| No. | Rate | No. | Rate | No. | Rate | No. | Rate | No. | Rate | |||||
| Maori and Pacific Islander | 11 | 20.3 | 27 | 13.0 | 74 | 80.1 | 30 | 113.0 | 139 | 20.4 | ||||
| Maori | 8 | 40.9 | 14 | 14.1 | 33 | 82.5 | 15 | 146.8 | 69 | 21.6 | ||||
| Pacific Islander |
3 |
16.4 |
|
13 |
12.0 |
|
41 |
78.2 |
|
15 |
91.8 |
|
70 |
19.3 |
| Other |
2 |
4.1 |
|
9 |
2.4 |
|
53 |
8.9 |
|
36 |
15.0 |
|
84 |
5.3 |
| Total | 13 | 33.0 | 36 | 6.1 | 127 | 18.4 | 66 | 24.4 | 225 | 8.1 | ||||
*Rate/100,000 population. Table includes only populations at risk. Use of a Poisson regression model indicated no evidence of a difference in the effect of ethnicity on risk in different age groups. The incidence rate ratios for all ages of Maori compared with others was 7.60 (95% confidence interval [CI] 5.10–11.32) and for Pacific Islanders compared with others was 8.84 (95% CI 6.17–12.65). For male vs. female, the incidence rate ratio was 1.29 (95% CI 0.96–1.74).