Table 2. Non-rotaviral acute gastroenteritis-coded hospitalizations rates per 1,000 population, incidence rate before and after the introduction of rotavirus vaccination, by Aboriginal status and age group, in Western Australia July 2004–June 2012.
| Age group | Aboriginal | Non-Aboriginal | ||||||||
| Jul ‘04–Jun ‘07 | Jul ‘07–Jun ‘12 | IRR (95% CI)a | Jul ‘04–Jun ‘07 | Jul ‘07–Jun ‘12 | IRR (95% CI)a | |||||
| n | Rate/1,000 | n | Rate/1,000 | n | Rate/1,000 | n | Rate/1,000 | |||
| <12 months | 551 | 115.18 (105.76, 125.21) | 616 | 79.76 (73.59, 86.32) | 0.69 (0.62, 0.78) | 1,164 | 16.60 (15.66, 17.58) | 1,664 | 11.45 (10.91, 12.02) | 0.69 (0.64, 0.74) |
| 12–23 months | 516 | 103.84 (95.08, 113.20) | 634 | 79.35 (73.29, 85.77) | 0.76 (0.68, 0.86) | 1,214 | 17.14 (16.19, 18.13) | 1,367 | 9.62 (9.12, 10.15) | 0.56 (0.52, 0.61) |
| 2–4 years | 307 | 19.63 (17.50, 21.96) | 487 | 19.34 (17.66, 21.14) | 0.99 (0.85, 1.14) | 1,417 | 6.54 (6.20, 6.88) | 1,730 | 4.22 (4.02, 4.42) | 0.65 (0.60, 0.69) |
| 5–9 years | 122 | 4.56 (3.79, 5.45) | 237 | 5.39 (4.72, 6.12) | 1.18 (0.95, 1.48) | 881 | 2.33 (2.18, 2.49) | 1,197 | 1.81 (1.71, 1.92) | 0.78 (0.71, 0.85) |
| 10–19 years | 139 | 2.94 (2.47, 3.47) | 224 | 2.69 (2.35, 3.06) | 0.91 (0.74, 1.14) | 1,374 | 1.68 (1.59, 1.77) | 2,436 | 1.71 (1.64, 1.78) | 1.02 (0.95, 1.09) |
| 20–44 years | 554 | 7.22 (6.63, 7.85) | 886 | 6.47 (6.05, 6.91) | 0.89 (0.80, 1.00) | 8,023 | 3.78 (3.70, 3.86) | 15,989 | 4.06 (4.00, 4.12) | 1.07 (1.05, 1.10) |
| 45–64 years | 360 | 13.29 (11.95, 14.74) | 830 | 15.66 (14.61, 16.76) | 1.18 (1.04, 1.34) | 7,527 | 5.11 (4.99, 5.22) | 16,030 | 5.82 (5.73, 5.92) | 1.14 (1.11, 1.17) |
| ≥65 years | 187 | 31.69 (27.31, 36.57) | 325 | 28.94 (25.87, 32.26) | 0.91 (0.76, 1.10) | 11,866 | 16.94 (16.64, 17.25) | 24,739 | 18.64 (18.41, 18.87) | 1.10 (1.08, 1.12) |
CI, confidence interval; IRR, incident rate ratio.
aIncidence rate ratio of rotavirus vaccine period to pre-rotavirus vaccine period hospitalization rate.