Table 1

Rates of hospitalisation for acute respiratory disease in Sydney children under 18 years of age, 2000, by age and study period, using Method 1*

Age group	Population at risk†	Number of hospitalisations		Mean weekly rate			Annual rate attributable to influenza (95% CI)‡
		Number of hospitalisations		Rate/100 000 population‡
		Influenza predominant period	Baseline period	Influenza predominant period	Baseline period	Excess attributable to influenza
*As per previous study.⁵
†Australian Bureau of Statistics mid-year estimate for 2000.
‡Rates and CIs rounded to whole numbers.
<1 y	55972	558	482	142	56	86	604 (514 to 694)
1 to <2 y	54566	443	459	116	55	61	424 (340 to 507)
2 to <5 y	161989	519	676	46	27	18	128 (97 to 159)
5 to <10 y	268358	217	261	12	6	5	36 (24 to 48)
10 to <18 y	417458	150	230	5	4	1	10 (4 to 17)