| Value | Category |
|---|---|
| 0 | No grade completed |
| 1 | Pre-school |
| 18 | Elementary graduate |
| 26 | High school graduate |
| 31 | Post secondary year 1 |
| 32 | Post secondary year 2 or more |
| 46 | College year 6 or more |
| 47 | College graduate |
| 51 | Post baccalaureate |
| 95 | Never attended school |
| 98 | DK |