| Value | Category |
|---|---|
| 1 | NO GRADE COMPLETED |
| 2 | PRESCHOOL |
| 3 | ELEMENTARY UNDERGRADUATE |
| 4 | ELEMENTARY GRADUATE |
| 5 | HIGH SCHOOL UNDERGRADUATE |
| 6 | HIGH SCHOOL GRADUATE |
| 7 | POST SECONDARY |
| 8 | COLLEGE UNDERGRADUATE |
| 9 | COLLEGE GRADUATE |
| 10 | POST GRADUATE DEGREE COMPLETED |
| 77 | DON'T KNOW |
| 99 | REFUSED |