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Table 1 Characteristics of the study cohort stratified by vaccination status and compared with the 2009 government data

From: Relative incidence and individual-level severity of seasonal influenza A H3N2 compared with 2009 pandemic H1N1

 

Hong Kong Population(Total = 6912020)a

Overall(Total = 420)

ESb

Vaccinatedc(Total = 113)

Unvaccinatedc(Total = 306)

P-valued

n

%

n

%

n

%

n

%

Age Group (years)

 2 -18

1129960

16.3

43

10.2

0.50

11

9.7

31

10.1

1.00

 19-44

2796560

40.5

101

24.0

19

16.8

82

26.8

0.05

 45-64

2092000

30.3

221

52.6

44

38.9

177

57.8

0.00

 65+

893500

12.9

55

13.1

39

34.5

16

5.2

0.00

Sex

 Female

3663660

53.0

249

59.3

0.13

62

54.9

186

60.8

0.33

 Male

3248360

47.0

171

40.7

51

45.1

120

39.2

0.33

Working Status

 Indivdulas aged 15 or abovee

  Unemployed/Home-makers/Retired/Others

2041100

29.5

200

47.6

0.43

55

48.7

145

47.4

0.90

  Employed populations

3479800

50.3

158

37.6

40

35.4

118

38.6

0.63

  Students

535800

7.8

38

9.0

12

10.6

26

8.5

0.63

 Indivdulas aged 2-15

855320

12.4

24

5.7

6

5.3

17

5.6

1.00

Education Attainmentf

 No schooling / Pre-primary

-

-

5

1.2

-

1

0.9

4

1.3

1.00

 Primary

-

-

65

15.5

27

23.9

38

12.4

0.01

 Secondary

-

-

197

46.9

39

34.5

158

51.6

0.00

 Drploma/Certiricate/Sub-degree/Craft-level

-

-

27

6.4

6

5.3

21

6.9

0.73

 Degree or above

-

-

62

14.8

22

19.5

40

13.1

0.14

 Studying (full-time)

-

-

62

14.8

18

15.9

43

14.1

0.74

 Missing

-

-

2

0.5

-

0

0.0

2

0.7

-

Living Districtg

 Hong Kong Island

1276074

18.5

77

18.3

0.08

16

14.2

61

19.9

0.23

 Kowloon

2036784

29.5

134

31.9

39

34.5

95

31.0

0.58

 New Territories

3597089

52.0

200

47.6

56

49.6

143

46.7

0.69

 Board vessels

2073

0.0

0

0.0

0

0.0

0

0.0

1.00

 Missing

0

0.0

9

2.1

-

2

1.8

7

2.3

-

  1. a2009 population aged 2 or above
  2. bES refers to effect size calculated by Cochran Q test
  3. cThere is one subject without vaccination status
  4. dP-values are calculated by chi-square tests or Fisher's exact tests
  5. eOnly individuals aged 15 or above, lived not on Board vessels and not admitted to hospitals were included in the 2009 government data
  6. fEducation attainment were only obtained for non full-time students while that of census also included full-time students
  7. gUniform age distribution within the age group 0-4 and even spatial distribution among districts were assumed for the 2009 government data