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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

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