| Value | Category |
|---|---|
| 1 | 1st |
| 2 | 2nd |
| 3 | 3rd |
| 4 | 4th |
| 5 | 5th |
| 6 | 6th |
| 7 | 7th |
| 8 | 8th |
| 9 | 9th |
| 10 | 10th |
| 11 | 11th |
| 12 | 12th |
| 13 | High school graduate |
| 14 | Some college |
| 15 | AA - occupational |
| 16 | AA - academic |
| 17 | BA |
| 18 | MS |
| 19 | Higher level |
| 20 | None |
| 21 | Nursery school |
| 22 | Kindergarten |
| 31 | No school completed |
| 32 | Nursery school |
| 33 | Kindergarten |