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Table 3 Quit ratesa for tobacco use during pregnancy 2012–2017, expressed as percent (unadjusted) and OR (adjusted)

From: Trends in maternal use of snus and smoking tobacco in pregnancy. A register study in southern Norway

 

Snus users (n = 1325 before pregnancy)

Smokers (n = 3165 before pregnancy)

%

OR

95% CI

P-value

%

OR

95% CI

P-value

Age groups

 16–24 years

67.1

1

Ref

54.4

1

Ref

 25–34 years

75.7

1.38

1.00–1.89

0.051

61.2

1.29

1.06–1.58

0.011

 35–44 years

75.3

1.69

0.84–3.42

0.142

56.8

1.15

0.86–1.54

0.331

Parity

 Two or more previous children

61.0

1

Ref

45.9

1

Ref

 One previous child

66,8

1.02

0.62–1.68

0.941

56.7

1.56

1.25–1.94

0.000

 No previous children

76.9

2.00

1.22–3.28

0.006

66.0

2.55

2.04–3.19

0.000

Education

 Primary, lower secondary

57.0

1

Ref

42.6

1

Ref

 Upper secondary

64.5

1.30

0.83–2.03

0.248

55.3

1.64

1.33–2.02

0.000

 Higher education

86.8

4.34

2.57–7.33

0.000

80.0

5.18

3.94–6.83

0.000

Time period

 2012–2014

66.1

1

Ref

57.7

1

Ref

 2015–2017

76.7

1.70

1.28–2.24

0.000

60.5

1.18

1.00–1.38

0.044

  1. Note: Time period with all six years as a continuous variable gave minimal changes to the ORs compared to the dichotomous variable in the model above. Only predictors found to alter the ORs were included in the main analyses. Interaction between the predictors parity and mothers age was tested, but was not found to be statistically significant
  2. aWomen who reported tobacco use before pregnancy, but no tobacco use in third trimester