0 = Male
1 = Female

1 = Malay
2 = Chinese
3 = Indian
4 = Siamese
5 = Others

1 = Married
2 = Unmarried/Divorced/Death of spouse

1 = None
2 = Primary school
3 = Secondary school
4 = Tertiary/College/University

1 = Employed
2 = Unemployed

1 = Yes
2 = No

1 = Oral only
2 = Oral and Insulin
3 = Insulin only

0 = not smoking
1 = smoking