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Table 2 Comparing study variables between cases and controls by adjusted odds ratios*

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

  Cases (193) Control (411) Odds ratio (Adjusted)
Count % Count % value 95 % CI p-value
Knowledge
Knowing oneself to be in the recommended group for flu vaccine 37 19.6 25 6.1 2.34 1.23 4.44 0.01
Knowing flu vaccine provides 70–90 % protection in healthy adults 89 46.6 140 34.1 1.86 1.12 3.10 0.02
Knowing about the Government Vaccination Programme 128 68.0 219 53.5 1.09 0.68 1.75 0.72
Knowing flu vaccine reduces flu complications and related hospitalisation 180 97.8 366 93.4 0.89 0.25 3.19 0.86
Needs
Live with children < 6 years or elderly >65 years 53 27.5 85 20.7 1.23 0.74 2.04 0.43
Presence of chronic disease(s) 78 40.4 111 27.1 1.13 0.65 1.96 0.67
Visited doctors in the past 3 months 92 47.7 141 34.3 1.12 0.67 1.87 0.68
Behaviour
Current smoker 16 8.3 20 4.9 0.72 0.27 1.92 0.52
Current drinker 34 17.6 80 19.5 - - - -
Belief & perception
Perceived having severe or moderate symptoms when contracting flu 17 8.8 15 3.6 2.90 1.21 6.97 0.02
Perceived flu vaccine to be safe 183 98.4 342 89.8 3.99 0.78 20.41 0.10
Believed flu vaccine has additional benefits other than flu protection 181 93.8 356 87.3 1.36 0.58 3.21 0.48
Health-care system
Eligible for free government vaccine 45 23.6 21 5.1 6.38 3.43 11.87 <0.001
Willing to receive flu vaccination for free 184 95.8 309 75.7 4.84 2.13 11.03 <0.001
Convenient to reach a vaccination location 187 96.9 370 90.0 2.87 1.06 7.74 0.04
Prefer public clinic for injection 105 54.7 291 71.0 0.35 0.22 0.55 <0.001
Will respond to Government telephone reminder service on flu shot 105 54.4 160 39.6 0.84 0.51 1.38 0.49
Advice
Accept advice from health professionals 183 94.8 333 81.2 2.67 1.19 5.99 0.02
Had family member receive flu vaccine 76 41.8 74 18.3 2.47 1.54 3.95 <0.001
Accept advice from relatives and friends 86 44.8 101 24.6 1.47 0.84 2.56 0.18
External factors
Will receive flu vaccine when there is an epidemic 181 94.8 327 81.3 2.40 1.07 5.37 0.03
  1. *All study variables in this table are binary categorical variables (yes/no) with the ‘no’ category being used as the reference group for calculating ORs. Statistically significant odds ratios (adjusted) are bold.