Table 3 Associations between smoking cessation during pregnancy and socio-demographic characteristics of women (N = 12,871)

Maternal age (years)

0.083^c

  ≤ 19

0.61

0.51–0.74

<0.001

0.97

0.75–1.24

 20–24

0.88

0.81–0.96

0.005

0.98

0.86–1.11

 25–29

1.00

1.00

 30–34

0.97

0.86–1.10

0.646

1.09

0.99–1.20

  ≥ 35

0.88

0.72–1.06

0.172

1.16

0.94–1.43

Residence

 Urban

1.00

1.00

 Rural

0.64

0.47–0.87

0.005

0.76

0.57–1.02

0.068

Ethnicity

 Russian

1.00

1.00

 Other

0.93

0.67–1.29

0.667

0.90

0.66–1.23

0.512

Education

<0.001^d

<0.001^d

 Incomplete secondary

0.13

0.10–0.18

0.19

0.15–0.24

 Secondary

0.31

0.21–0.47

0.39

0.27–0.55

 Vocational

0.50

0.35–0.71

0.57

0.41–0.78

 University

1.00

1.00

 Unknown

0.09

0.04–0.19

0.12

0.06–0.25

Marital status

 Married

1.00

1.00

 Cohabitation

0.46

0.33–0.64

<0.001

0.53

0.39–0.72

<0.001

 Single

0.43

0.34–0.54

<0.001

0.49

0.41–0.58

<0.001

Parity

<0.001^c

<0.001^c

 0

2.37

1.96–2.85

2.21

1.78–2.75

 1

2.05

1.71–2.45

1.69

1.46–1.95

  ≥ 2

1.00

1.00