Rates of annual hospitalisation attributable to influenza by age, Sydney children under 18 years, using different methods*
| Age group | Annual rate/100 000 persons† (95% CI)‡ | ||||
|---|---|---|---|---|---|
| 2000 | 1994–2001 | ||||
| Method 1 | Method 3 | Method 2§ | Method 2¶ | Method 3 | |
| *As per previous studies for Method 15 and Method 2.2 | |||||
| †Population at risk based on Australian Bureau of Statistics mid-year estimates for 2000 (2000) or 1998 (1994–2001). | |||||
| ‡Rates and CIs rounded to whole numbers. | |||||
| §Using summer baseline. | |||||
| ¶Using periseasonal baseline. | |||||
| <1 y | 604 (514 to 694) | 177 (173 to 180) | 489 (473 to 504) | 153 (126 to 180) | 96 (95 to 96) |
| 1 to <2 y | 424 (340 to 507) | 64 (61 to 68) | 377 (363 to 391) | 92 (73 to 111) | 44 (44 to 45) |
| 2 to <5 y | 128 (97 to 159) | 17 (15 to 18) | 184 (165 to 203) | 10 (0 to 26) | 16 (16 to 16) |
| 5 to <10 y | 36 (24 to 48) | 4 (3 to 5) | 54 (37 to 72) | 2 (0 to 12) | 5 (4 to 5) |
| 10 to <18 y | 10 (4 to 17) | 5 (4 to 5) | 18 (1 to 35) | 6 (0 to 19) | 2 (2 to 3) |