Table 1.
Number of admissions and hospitalisation rate for ARI by diagnostic category by principal diagnosis in infants aged <1 year and children aged 1–4 years in Western Australia, England and Scotland
| Diagnosis | Western Australia | England | Scotland | |||
| n (%) | Rate (95% CI)* | n (%) | Rate (95% CI)* | n (%) | Rate (95% CI)* | |
| <1 year† | ||||||
| Whooping cough | 220 (1.6) | 0.7 (0.6 to 0.8) | 2395 (1.1) | 0.5 (0.4 to 0.5) | 372 (1.4) | 0.6 (0.5 to 0.6) |
| Pneumonia | 1278 (9.4) | 4.1 (3.9 to 4.4) | 15 592 (7.2) | 2.9 (2.9 to 3.0) | 1245 (4.8) | 1.9 (1.8 to 2.1) |
| Bronchiolitis | 10 652 (78.7) | 34.4 (33.8 to 35.1) | 171 805 (78.8) | 32.2 (32.1 to 32.4) | 22 021 (84.4) | 34.3 (33.9 to 34.8) |
| Influenza | 407 (3.0) | 1.3 (1.2 to 1.4) | 1627 (0.7) | 0.3 (0.3 to 0.3) | 426 (1.6) | 0.7 (0.6 to 0.7) |
| Unspecified ALRI | 809 (6.0) | 2.6 (2.4 to 2.8) | 24 563 (11.3) | 4.6 (4.5 to 4.7) | 1797 (6.9) | 2.8 (2.7 to 2.9) |
| Bronchitis | 169 (1.2) | 0.5 (0.5 to 0.6) | 2003 (0.9) | 0.4 (0.4 to 0.4) | 242 (0.9) | 0.4 (0.3 to 0.4) |
| All ARI | 13 535 (100.0) | 43.7 (43.0 to 44.5) | 217 985 (100.0) | 40.1 (40.7 to 41.1) | 26 103 (100.0) | 40.7 (40.2 to 41.2) |
| 1–4 years‡ | ||||||
| Whooping cough | 33 (0.4) | 0.04 (0.03 to 0.06) | 95 (0.1) | 0.008 (0.007 to 0.01) | 23 (0.2) | 0.01 (0.01,0.02) |
| Pneumonia | 3031 (41.6) | 3.7 (3.6 to 3.9) | 29 741 (33.2) | 2.5 (2.5 to 2.6) | 3411 (26.9) | 2.1 (2.0 to 2.1) |
| Bronchiolitis | 1893 (26.0) | 2.3 (2.2 to 2.4) | 8283 (9.2) | 0.7 (0.7 to 0.7) | 3141 (24.7) | 1.9 (1.8 to 2.0) |
| Influenza | 366 (5.0) | 0.4 (0.4 to 0.5) | 1714 (1.9) | 0.2 (0.1 to 0.2) | 392 (3.1) | 0.2 (0.2 to 0.3) |
| Unspecified ALRI | 1767 (24.3) | 2.2 (2.1 to 2.3) | 48 910 (54.6) | 4.2 (4.1 to 4.2) | 5570 (43.9) | 3.3 (3.3 to 3.4) |
| Bronchitis | 195 (2.7) | 0.2 (0.2 to 0.3) | 859 (1.0) | 0.1 (0.1 to 0.1) | 161 (1.3) | 0.1 (0.1 to 0.1) |
| All ALRI | 7285 (100.0) | 9.0 (8.8 to 9.2) | 89 602 (100.0) | 7.6 (7.6 to 7.7) | 12 698 (100.0) | 7.6 (7.5 to 7.8) |
*Rate is per 1000/child-years.
†2001–2012 for Western Australia and Scotland; 2004–2012 for England.
‡2005–2012 for Western Australia and Scotland; 2008–2012 for England.
ALRI, acute lower respiratory infection; ARI, acute respiratory infection.