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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.