Table 1 Independent Variables

Agegroup

18~45^a =0

46~59 = 1

60 and above =2

Economic level

The poorest^a = 0 The poorer = 1

The middle = 2 The richer = 3

The richest = 4

Gender

Male^a = 0 Female = 1

Smoking

No^a = 0 Yes = 1

Drinking

Less than 3 times a week^a = 0

More than 3 times a week = 1

Have physical examination in the past 4 weeks

No^a = 0 Yes = 1

Region

East^a = 0 Middle = 1 West = 2

Schooling

Illiteracy^a = 0

Primary and junior high school = 1

High and technical secondary school = 2

Junior college and above = 3

BMI

BMI < 18.5^a =0

18.5 ≤ BMI < 24 = 1

24 ≤ BMI < 28 = 2

BMI ≥ 28 = 3

Marital status

Unmarried^a = 0 Married = 1

Others = 2