Table 2 Trend of the prevalence (%) of smoking during pregnancy, by age, 2010–2017

9.23

2.94

12.45

14.45

9.30

5.66

4.52

4.64

2.90

8.94

2.38

11.84

14.19

9.09

5.65

4.45

4.41

2.75

8.71

2.91

11.15

13.81

9.01

5.66

4.38

4.26

2.52

8.47

2.55

10.64

13.33

8.94

5.67

4.37

4.08

2.06

8.37

2.60

10.21

12.97

9.00

5.69

4.56

4.11

2.53

7.72

2.36

9.27

11.73

8.55

5.40

4.47

3.76

2.13

7.18

2.50

8.52

10.71

8.13

5.18

4.42

3.61

1.95

6.89

1.68

8.25

9.88

7.94

5.15

4.39

3.63

1.71

<.0001

0.01

<.0001

<.0001

<.0001

<.0001

0.08

<.0001

<.0001