Table 4 Associations of anthropometric data, leisure activities, smoking in their social environment, educational level of their parents, knowledge about smoking related diseases and measures against smoking with smoking status

Male gender, n(%)

1610 (60.2)

8196 (50.7)

1.48

1.36, 1.61

<0.001 (81.9;1)

1.31

1.17,1.48

<0.001

Mean age in years (SD)

16.54 (1.25)

15.09 (1.63)

1.88

1.82, 1.95

<0.001 (1386;1)

1.49

1.42, 1.55

<0.001

Mean BMI in kg/m² (SD)

21.88 (4.91)

20.62 (4.53)

1.06

1.05, 1.08

<0.001 (139.0;1)

Sports activities (≥ 3 times/week), n (%)

779 (30.7)

7933 (50.6)

0.43

0.40, 0.47

<0.001 (334.4;1)

0.59

0.53, 0.67

<0.001

Internet cafes (≥ 3 times/week), n (%)

821 (32.3)

2556 (16.3)

2.48

2.25, 2.73

<0.001 (350.1;1)

1.53

1.35, 1.74

<0.001

Watch TV everyday, n (%)

927 (36.5)

6068 (38.7)

0.89

0.82, 0.98

0.013 (6.23;1)

0.74

0.66, 0.84

<0.001

Smokers in the social environment, n (%)

Father

1783 (66.6)

8383 (51.7)

1.83

1.68, 2.00

<0.001 (186.1;1)

1.37

1.22, 1.54

<0.001

Mother

1377 (51.5)

6056 (37.4)

1.77

1.63, 1.93

<0.001 (180.7;1)

1.26

1.13, 1.41

<0.001

Siblings

1108 (41.4)

2363 (14.6)

4.02

3.68, 4.40

<0.001 (932.2;1)

2.24

1.99, 2.51

<0.001

Friends

2443 (91.2)

5229 (32.3)

20.96

18.26, 24.06

<0.001 (1864;1)

10.01

8.53, 11.74

<0.001

Favorite teacher

793 (29.6)

3956 (24.4)

1.31

1.20, 1.44

<0.001 (33.5; 1)

Favorite artist

914 (34.3)

3750 (23.1)

1.72

1.58, 1.88

<0.001 (143.8;1)

1.18

1.04, 1.33

0.009

Educational level of the parents, n (%)

Father: University

785 (29.7)

6150 (38.7)

1.00

reference

(78.2;2)

Father: High School

1422 (53.8)

7816 (49.2)

1.38

1.26, 1.52

<0.001

Father: Elementary school

435 (16.5)

1923 (12.1)

1.74

1.52, 1.98

<0.001

Mother: University

865 (32.9)

6546 (41.3)

1.00

reference

(90.1;2)

Mother: High School

1392 (52.9)

7857 (49.6)

1.29

1.17, 1.41

<0.001

Mother: Elementary school

375 (14.2)

1446 (9.1)

1.93

1.68, 2.21

<0.001

Smoking is related with, n (%)

Lung cancer

2244 (90.2)

15140 (94.0)

.57

0.49, 0.66

<0.001 (53.6;1)

0.74

0.61, 0.91

0.003

Chronic bronchitis

085 (43.7)

7553 (46.9)

0.86

0.79, 0.94

0.001 (11.4;1)

0.86

0.77, 0.97

0.012

Heart diseases

1485 (59.7)

10682 (66.3)

0.74

0.68, 0.81

<0.001 (45.9;1)

0.83

0.74, 0.93

0.002

Stroke

840 (33.8)

5689 (35.3)

0.91

0.83, 0.99

0.036 (4.4;1)

Messages in the cigarette affect them, n (%)

516 (20.3)

9159 (58.1)

0.19

0.17, 0.21

<0.001 (1022;1)

0.42

0.37, 0.48

<0.001

Anti-smoking measures are necessary, n (%)

1734 (68.3)

15035 (96.0)

0.09

0.08, 0.10

<0.001 (1615;1)

0.21

0.18, 0.24

<0.001