Table 1 Assignment of observed variables

 1.Gender

1 = male, 2 = female

 2.Age in years

1 = 15–29, 2 = 30–44, 3 = 45–59, 4 = 60–69, 5 = 70–79

 3.BMI

1 = underweight, 2 = healthy weight, 3 = overweight, 4 = obese

 4.Marital status

1 = unmarried, 2 = married, 3 = divorce, 4 = widowed

 5.Residence: location from nearest medial institutions

1 = < 1 km, 2 = ≤3 km,

3 = ≤5 km, 4 = >5 km

 6.Monthly income

1 = < 1000 RMB [¥], 2 = 1000–2999 RMB [¥],

3 = 3000–4999 RMB [¥], 4 = ≥5000 RMB [¥]

 7.Occupation

1 = unemployed, 2 = agricultural worker, 3 = worker,

4 = business personnel, freelancer, 5 = enterprise worker,

6 = institutional staff, 7 = civil Servants

 8.Education

1 = primary school or below, 2 = junior high school,

3 = senior high school, 4 = associate bachelor or above

 9.Health knowledge

1 = poor status (correct rate < 80%) 2 = not poor (correct rate ≥ 80%)

 10.Health behavior

1 = poor status (correct rate < 80%) 2 = not poor (correct rate ≥ 80%)

 11.Health skills

1 = poor status (correct rate < 80%) 2 = not poor (correct rate ≥ 80%)