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Table 1 The demographic feature of pregnant women with first-hand smoke (FHS) and second hand smoke (SHS) exposure in a rural area of Shanghai in 2018, China (n = 8586)

From: Low birthweight of children is positively associated with mother’s prenatal tobacco smoke exposure in Shanghai: a cross-sectional study

Variables

Pregnant women (8586)

FHS exposure (81)

SHS exposure (1785)

n

Proportion (%)

n

Prevalence (%)

n

Prevalence (%)

Age (years)†‡

 19–25

237

2.76

6

2.53

62

26.16

 26–30

2870

33.43

25

0.87

728

25.37

 31–35

3858

44.93

29

0.75

730

18.92

 36–48

1621

18.88

21

1.30

265

16.35

BMI before the pregnancy

 Less than 18.50

1819

21.19

18

0.99

390

21.44

 18.50–23.99

5278

61.47

50

0.95

1054

19.97

 24.00–27.00

526

6.13

4

0.76

103

19.58

 Over 27.00

963

11.22

9

0.93

238

24.71

Education†‡

 Illiterate/Primary

71

0.83

1

1.41

14

19.72

 Junior High

795

9.26

14

1.76

181

22.77

 Senior High

1613

18.79

25

1.55

373

23.12

 College and above

6107

71.13

41

0.67

1217

19.93

Family yearly income (CNY)

 Less than 50, 000

1344

15.65

15

1.12

334

24.85

 50, 000–100, 000

1206

14.05

9

0.75

273

22.64

 100, 001–150, 000

1117

13.01

12

1.07

239

21.40

 150, 001–300, 000

1169

13.62

11

0.94

204

17.45

 Over 300, 000

3750

43.68

34

0.91

735

19.60

Residency status†‡

 Local resident

4545

52.94

56

1.23

1094

24.07

 Non-local resident

4041

47.06

25

0.62

691

17.10

Gestational diabetes mellitus (GDM)†‡

 Yes

533

6.21

10

1.88

144

27.02

 No

8053

93.79

71

0.88

1641

20.38

  1. the differences between group on prevalence of prenatal first-hand smoke exposure was statistically significant (P < 0.01)
  2. the differences between group on prevalence of prenatal second-hand smoke exposure was statistically significant (P < 0.01)