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Table 1 Demography of the cases and controls

From: Factors associated with uptake of influenza vaccine in people aged 50 to 64 years in Hong Kong: a case–control study

  Case (n = 193) Control (n = 411) Crude odd ratio (OR)
No. % No. % OR 95 % CI p-value*
Average age (mean year) ± SD** 57.3 ± 4.8 56.3 ± 4.4 - - -
Sex Male 73 37.8 159 38.7 1 ref***   ref
  Female 120 62.2 252 61.3 1.04 0.73 1.48 0.84
Age group 50 - 54 59 30.6 176 42.8 1 ref ref
  55 - 59 63 32.6 119 29.0 1.58 1.03 2.41 0.04
  60 - 64 71 36.8 116 28.2 1.83 1.20 2.77 0.005
Ethnic Chinese 193 100.0 410 99.8 - - -
Education Primary or below 58 30.1 110 26.8 1 ref ref
  Secondary 120 62.2 260 63.9 0.88 0.60 1.29 0.50
  Tertiary or above 15 7.8 37 9.1 0.77 0.39 1.52 0.46
Status Retired 52 26.9 69 16.8 - - -
  Housewife 47 24.4 112 27.3 - - -
Employed Yes 83 43.0 198 48.2 0.82 0.58 1.15 0.24
  No 110 57.0 213 51.8 1 ref ref
Current smoker Yes 16 8.3 20 4.9 1.77 0.89 3.49 0.11
  No 177 91.7 391 95.1 1 ref ref
  1. *p-value is the value of crude OR when compared to reference
  2. **standard deviation
  3. ***ref is reference