Incidence estimates, rate ratios, and confidence intervals (CI) of intussusception for sex, ethnicity, and region in infants <12 months of age between January 1998 and June 2003
| Cases | Population* | Incidence† | 95% CI | Rate ratio | 95% CI of rate ratio | p value | |
|---|---|---|---|---|---|---|---|
| *Exposed age adjusted population for the 5.5 year period. | |||||||
| †Per 100 000 child-years. | |||||||
| ‡2123 children of “other” ethnicity not included. | |||||||
| Gender | (n = 200) | ||||||
| Male | 129 | 157322 | 82 | (68 to 96) | 1.0 | ||
| Female | 71 | 149666 | 47 | (36 to 58) | 0.58 | (0.41 to 0.75) | 0.002 |
| Ethnicity‡ | (n = 194) | ||||||
| European | 125 | 165325 | 76 | (62 to 89) | 1.0 | ||
| Maori | 34 | 86174 | 39 | (26 to 53) | 0.52 | (0.32 to 0.72) | 0.004 |
| Pacific | 22 | 32676 | 67 | (39 to 95) | 0.89 | (0.49 to 1.29) | 0.63 |
| Asian | 13 | 20696 | 63 | (29 to 97) | 0.83 | (0.36 to 1.31) | 0.54 |
| Region | (n = 199) | ||||||
| North Island | 152 | 244525 | 62 | (52 to 72) | 1.0 | ||
| South Island | 47 | 62464 | 75 | (54 to 97) | 1.21 | (0.81 to 1.61) | 0.26 |