Table 1 Demographics and smoking situation in the participant families

Family level data

22

Family income (RMB/year)

 >100000

4

 50000–100000

4

 20000–50000

13

 <20000

1

Number of smokers at home

 1

7

 2

15

Household restrictions

 No smoking allowed inside the house

3

 Smoking allowed in certain rooms

12

 No restrictions

7

Families with children*

6

 ≤one year old

17

 > one year old

Individual level data

29

Family roles (In relation to young children)

 Mothers

16

 Fathers

4

 Grandmothers

5

 Grandfathers

4

Age (years old)

 Mothers and fathers (21–34)

20

 Grandmothers and grandfathers (55–67)

9

Occupation

 No job (farming only)

11

 Off-farm activities

18

Education

 Elementary school or below

6

 Middle school

14

 Senior high school or vocational school

7

 College

2

 University

0