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Table 1 The admission rates and pneumonia cases according to age in the total cohort (n = 4,463)

From: Pandemic 2009 H1N1 virus infection in children and adults: A cohort study at a single hospital throughout the epidemic

Age groups 0-15 y
(n = 2971)
16-40 y
(n = 1222)
41-64y
(n = 228)
≥ 65 y
(n = 42)
P
% of total cases 66. 6 27.4 5.1 0.9 -
Male:female ratio 1.1:1 1:1.1 1:1.5 1:2 < 0.001
Admission rate (%, n) 7.3 (217) 8.2 (100) 15.4 (35) 50 (21) < 0.001
Pneumonia (%, n) 2.7 (80) 1.3 (16) 3.9 (9) 26.2 (11) 0.003