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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