G01
1 = Male
2 = Female

G02
1 = 18-24 years old
2 = 25-34 years old
3 = 35-44 years old
4 = 45-54 years old
5 = 55-64 years old
6 = above 65 years old

G03
1 = Primary/Secondary school
2 = High school
3 = Undergraduate
4 = Postgraduate

G04
1 = Student
2 = Agriculture
3 = Construction/Manufacturing
4 = Business/ Service
5 = Pedagogy/Office
6 = Retirement
7 = Others

G05
1 = under 3 years
2 = 3-5 years
3 = 5-10 years
4 = 10-15 years
5 = 15-20 years
6 = above 20 years

G06
1 = Son An
2 = Son Thinh
3 = Son Hoa