Table 1 Background characteristics of enrolled pregnant women in Siem Reap, Cambodia

Age

mean = 28.3 ± 5.7

mean = 29.4 ± 5.4

mean = 28.2 ± 5.7

0.098

 15–19

70

4.47

0

0

70

4.67

0.420

 20–24

338

21.60

15

22.39

323

21.56

 25–29

540

34.50

20

29.85

520

34.71

 30–34

391

24.98

20

29.85

371

24.77

 35–39

180

11.50

10

14.93

170

11.35

  ≥ 40

46

2.94

2

2.99

44

2.94

Education level

  ≤ Primary School

324

20.7

13

19.4

311

20.76

0.758

 High School

857

54.76

35

52.24

822

54.87

 University

384

24.54

19

28.36

365

24.37

Occupation of Household

 Farmer/Fisherman/Laborer

255

16.29

6

8.96

249

16.62

0.318

 Public Officer

217

13.87

10

14.93

207

13.82

 Privat Company Employee

495

31.63

26

38.81

469

31.31

 Self-Employed

598

38.21

25

37.31

573

38.25

Number of children

 1–3

1469

93.87

63

94.03

1406

93.86

0.954

  ≥ 4

96

6.13

4

5.97

92

6.14

Blood transfusion history

 No

1527

97.57

65

97.01

1462

97.60

0.762

 Yes

38

2.43

2

2.99

36

2.40

Surgical history

 No

1361

86.96

62

92.54

1299

86.72

0.166

 Yes

204

13.04

5

7.46

199

13.28

Ever received HepB

 Yes

236

15.08

3

4.48

233

15.55

0.029

 No

1313

83.9

64

95.52

1249

83.38

Don’t know

16

1.02

0

0

16

1.07