Table 3. Comparison of weekly directly observed rates (per 100,000 population) and excess rates of hospitalization associated with influenza estimated by the Bayesian approach, during the interpandemic period (4 January 2004–25 April 2009) and pandemic period (26 April 2009–14 August 2010).

Virus/Age group	Interpandmic		Pandemic
	Directly observed rates	Excess rates (95% CI)	Directly observed rates	Excess rates (95% CI)
sH1N1
<1	4.2	3.2 (0.3, 6.6)	0.0	0.4 (0.0, 1.0)
1–5	3.9	2.9 (1.0, 4.6)	0.7	0.8 (0.3, 1.3)
6–17	0.6	0.6 (0.3, 0.9)	0.1	0.1 (0.0, 0.1)
H3N2
<1	8.9	12.0 (6.9, 17.3)	5.7	8.1 (4.6, 11.6)
1–5	6.2	9.0 (7.0, 11.0)	5.1	6.4 (4.9, 8.0)
6–17	0.7	0.9 (0.6, 1.2)	0.3	0.9 (0.6, 1.3)
pH1N1
<1	na	na	17.2	11.3 (1.2, 21.9)
1–5	na	na	12.4	12.2 (8.2, 16.3)
6–17	na	na	2.9	2.6 (2.0, 3.2)
Influenza B
<1	2.8	1.9 (0.1, 5.1)	0.0	0.8 (0.0, 2.2)
1–5	5.6	5.9 (4.0, 8.0)	0.7	5.2 (3.4, 7.0)
6–17	1.0	1.1 (0.8, 1.4)	1.0	1.1 (0.8, 1.6)
RSV
<1	36.5	48.1 (38.7, 57.0)	45.8	48.3 (39.3, 57.9)
1–5	10.6	9.0 (5.1, 12.6)	12.7	12.4 (7.0, 17.2)
6–17	0.1	0.3 (0.0, 0.7)	0.2	0.4 (0.0, 1.1)
Parainfluenza
<1	24.8	15.9 (8.0, 23.7)	13.3	11.6 (5.7, 17.6)
1–5	9.9	5.0 (1.8, 8.0)	10.9	6.3 (2.2, 10.3)
6–17	0.1	0.2 (0.1, 0.4)	0.3	0.4 (0.1, 0.8)
Adenovirus
<1	10.3	2.4 (0.1, 5.4)	5.7	2.2 (0.1, 5.1)
1–5	9.6	1.7 (0.1, 4.3)	5.5	1.0 (0.0, 2.6)
6–17	0.6	0.5 (0.2, 0.9)	0.1	0.2 (0.1, 0.3)

Abbreviations: RSV, respiratory syncytial virus; NA, not available.