Junior high school students

High school students

OR

95%CI

P

OR

95%CI

P

School year

1.17

1.04

1.32

0.01

1.21

1.10

1.33

0.00

Sex

Male

Reference

Reference

Female

0.61

0.50

0.74

0.00

0.39

0.33

0.46

0.00

Father smokes

0.96

0.79

1.16

0.65

1.27

1.09

1.48

0.00

Mother smokes

3.24

2.63

3.99

0.00

2.62

2.16

3.18

0.00

Older brother smokes

2.74

1.99

3.79

0.00

2.21

1.78

2.75

0.00

Older sister smokes

3.78

2.44

5.87

0.00

3.28

2.36

4.56

0.00