Age group
1 = ~30
2 = 30~34
3 = 35~

Level of Education
1 = senior high school or below
2 = junior college
3 = college graduate
4 = graduate degree or above

Income RMB
1 = ~5k
2 = ~9k
3 = >9k

Family history of diabetes
0 = No
1 = Yes
2 = Not sure

1 = <18.5
2 = ~24.9
3 = >=25