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Table 1 Blood donor characteristics regarding main confounding factors, vaccination and inclusion criteria

From: Effectiveness of DNA-recombinant anti-hepatitis B vaccines in blood donors: a cohort study

Risk factors

Included in the analysis

Excluded from the analysis

Variables

Categories

Non-vaccinated repeat donors

 

Vaccinated repeat donors

 

Vaccinated non-repeat donors

 

Vaccinated donors lost to follow-up

 
  

n

%

n

%

n

%

n

%

Age bands (years)

18–29

112

15.7

105

15.0

26

12.7

18

16.4

 

30–44

351

49.2

323

46.3

106

52.0

56

50.9

 

45+

250

35.1

270

38.7

72

35.3

36

32.7

Sex

Masculine

376

52.7

377

54.0

113

55.4

51

46.4

 

Feminine

337

47.3

321

46.0

91

44.6

59

53.6

Marrital status

Single

169

23.7

179

25.6

5

20.8

40

36.4

 

Married

484

67.9

470

67.3

16

66.7

67

60.9

 

Separated

12

1.7

13

1.9

1

4.2

2

1.8

 

Widowed

24

3.4

19

2.7

2

8.33

1

0.9

 

Other

24

3.6

17

2.4

0

0.0

0

0.0

Municipality of residence

County capital

269

37.7

392

56.2

78

38.2

40

36.4

 

Other cities *

175

24.5

51

7.3

31

15.2

20

18.2

 

Mainly rural **

269

37.7

255

36.5

95

46.6

50

45.4

Number of donations prior to study

1–2

120

16.8

40

5.7

8

33.3

59

54.6

 

3–5

403

56.5

89

12.7

13

54.2

34

31.5

 

6–10

169

23.7

224

32.1

2

8.33

9

8.33

 

>10

21

2.9

345

49.4

1

4.2

6

5.6

  1. * with at least 20,000 inhabitants
  2. ** less than 20,000 inhabitants