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Table 1 Infection-hospitalization risks based on confirmed hospitalization (cIHR) and on excess hospitalization (eIHR) during the first wave of the 2009 H1N1 pandemic

From: Hospitalization risk of the 2009 H1N1 pandemic cases in Hong Kong

Age

Population

Infection attack rate*

Confirmed Hospitalization

cIHR

Excess Hospitalization

eIHR

  

%

(95% CI)

No.

Rate(per 100,000 population)

%

(95% CI)

No.

Rate(per 100,000 population)

%

(95% CI)

0-4

234583

NA

 

1842

785.2

NA

 

2067

881.3

NA

 

5-14

635423

43.5

(39.6, 48.3)

2445

384.8

0.9

(0.8, 1.0)

2774

436.6

1.0

(0.0, 2.0)

15-29

1410126

16.9

(12.4, 21.3)

1313

93.1

0.6

(0.4, 0.8)

1650

117.0

0.7

(0.2, 1.2)

30-39

1118446

5.8

(3.1, 9.7)

470

42.0

0.7

(0.4, 1.4)

554

49.6

0.9

(-2.2, 3.9)

40-49

1267108

3.8

(1.1, 7.5)

375

29.6

0.8

(0.4, 2.7)

501

39.5

1.0

(-3.6, 5.7)

50-59

1073032

5.0

(2.4, 8.3)

495

46.1

0.9

(0.6, 1.9)

878

81.8

1.6

(-3.3, 6.5)

60+

1249965

0.8

(0.2, 4.2)

446

35.7

4.5

(0.8, 17.8)

1754

140.3

17.5

(-64.4, 99.4)

  1. Abbreviations: CI confidence interval, NA not available.
  2. * Adapted from ref (4,5).