Table 2 Time trends in the prevalence of current smoking between 2008 and 2016 according to the SES indicators by sex

Boys

1230

(100)

141

11.5

(9.7, 13.2)

1218

(100)

91

7.5

(6.0, 8.9)

1294

(100)

61

4.7

(3.6, 5.9)

<0.001

 High

396

(32.2)

25

6.3

(3.9, 8.7)

463

(38.0)

31

6.7

(4.4, 9.0)

448

(34.7)

19

4.2

(2.4, 6.1)

0.183

 Middle

262

(21.3)

31

11.8

(7.9, 15.7)

240

(19.7)

11

4.6

(1.9, 7.2)

315

(24.3)

11

3.5

(1.5, 5.5)

<0.001

 Low

572

(46.5)

85

14.9

(11.9, 17.8)

515

(42.3)

49

9.5

(7.0, 12.0)

531

(41.0)

31

5.8

(3.8, 7.8)

<0.001

 P for chi-square test

<0.001

0.041

0.251

 Both parents

907

(73.7)

88

9.7

(7.8, 11.6)

870

(71.4)

56

6.4

(4.8, 8.1)

941

(72.7)

40

4.3

(3.0, 5.5)

<0.001

 Others

62

(5.0)

11

17.7

(8.2, 27.3)

79

(6.5)

6

7.6

(1.8, 13.4)

55

(4.3)

2

3.6

(-1.3, 8.6)

0.009

 Single parent

261

(21.2)

42

16.1

(11.6, 20.5)

269

(22.1)

29

10.8

(7.1, 14.5)

298

(23.0)

19

6.4

(3.6, 9.1)

<0.001

 P for chi-square test

0.005

0.065^b

0.345^b

 General HS

809

(65.8)

79

9.8

(7.7, 11.8)

777

(63.8)

34

4.4

(2.9, 5.8)

889

(68.7)

21

2.4

(1.4, 3.4)

<0.001

 Vocational HS

421

(34.2)

62

14.7

(11.3, 18.1)

441

(36.2)

57

12.9

(9.8, 16.1)

405

(31.3)

40

9.9

(7.0, 12.8)

0.036

 P for chi-square test

0.010

<0.001

<0.001

Girls

1298

(100)

80

6.2

(4.9, 7.5)

1433

(100)

40

2.8

(1.9, 3.6)

1429

(100)

27

1.9

(1.2, 2.6)

<0.001

 High

376

(29.0)

17

4.5

(2.4, 6.6)

499

(34.8)

9

1.8

(0.6, 3.0)

397

(27.8)

3

0.8

(-0.1, 1.6)

<0.001

 Middle

351

(27.0)

14

4.0

(1.9, 6.0)

355

(24.8)

5

1.4

(0.2, 2.6)

414

(29.0)

6

1.4

(0.3, 2.6)

0.021

 Low

571

(44.0)

49

8.6

(6.3, 10.9)

579

(40.4)

26

4.5

(2.8, 6.2)

618

(43.2)

18

2.9

(1.6, 4.2)

<0.001

 P for chi-square test

0.006

0.008^b

0.040^b

 Both parents

933

(71.9)

42

4.5

(3.2, 5.8)

1041

(72.6)

17

1.6

(0.9, 2.4)

978

(68.4)

14

1.4

(0.7, 2.2)

<0.001

 Others

66

(5.1)

6

9.1

(2.2, 16.0)

67

(4.7)

2

3.0

(-1.1, 7.1)

66

(4.6)

2

3.0

(-1.1, 7.2)

0.111

 Single parent

299

(23.0)

32

10.7

(7.2, 14.2)

325

(22.7)

21

6.5

(3.8, 9.1)

385

(26.9)

11

2.9

(1.2, 4.5)

<0.001

 P for chi-square test

<0.001^b

<0.001^b

0.123^b

 General HS

892

(68.7)

46

5.2

(3.7, 6.6)

1062

(74.1)

21

2.0

(1.1, 2.8)

962

(67.3)

10

1.0

(0.4, 1.7)

<0.001

 Vocational HS

406

(31.3)

34

8.4

(5.7, 11.1)

371

(25.9)

19

5.1

(2.9, 7.4)

467

(32.7)

17

3.6

(1.9, 5.3)

0.003

 P for chi-square test

0.025

0.002

0.001