Table 1 Variables and assignments of preventive behaviours and related factors

Dependent variables

 Outdoor prevention

0 = no; 1 = yes

 Indoor prevention

0 = no; 1 = yes

Demographic factors

 Age (years)

1 = 10–20; 2 = 20–39; 3 = 40–59; 4 =  ≥ 60

 Sex

1 = male; 2 = female

 Education level

1 = 0–9 years; 2 = 10–12 years; 3 =  ≥ 13 years

 Occupation

1 = no work; 2 = students; 3 = blue-collar; 4 = white-collar

 Living place

1 = urban; 2 = rural

 Living style

1 = living alone; 2 = living with others

Information

 Number of informative channels

1 = 0–3; 2 = 4–6; 3 = 7–9

 Motivation for sharing

1 = none; 2 = low; 3 = medium; 4 = high

Health status

 Physical health status

1 = worse; 2 = same; 3 = better

Social support

 Current relationship with friends

1 = worse; 2 = same; 3 = better

 Community performance

1 = poor; 2 = neutral; 3 = good

Family

 Annual household income

1 = < CNY 100 000; 2 = CNY100 000–300 000; 3 = > CNY 300 000

 Household Size

1 = 1–3; 2 = 4–6; 3 = > 6