Incidence rate estimates and 95% confidence intervals (CI) of intussusception in New Zealand children younger than 3 years of age between January 1998 and June 2003
| Age group | Cases | Population* | Incidence† | 95% CI |
|---|---|---|---|---|
| *Exposed age adjusted population for the 5.5 year period. | ||||
| †Per 100 000 child-years. | ||||
| <1 year | 200 | 306994 | 65 | (56 to 75) |
| 1–2 years | 56 | 308413 | 18 | (14 to 24) |
| 2–3 years | 21 | 312208 | 6.7 | (4.2 to 10) |
| Total | 277 | 927615 | 30 | (26 to 34) |