| Value | Category |
|---|---|
| 1 | 1. Did not/never go to school |
| 2 | 2. Did not finish elementary school |
| 3 | 3. Elementary school/eqv |
| 4 | 4. Junior Highschool/eqv |
| 5 | 5. Senior Highschool/eqv |
| 6 | 6. 1/2/3 years diploma |
| 7 | 7. 4 yrs diploma/bachelor degree |
| 8 | 8. Master's/PhD |
| 9 | 9. Missing |
| Sysmiss |