| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade (basic education) | 517 |
18.7%
|
| 2 | 8th grade (basic education) | 547 |
19.8%
|
| 3 | 1st year of middle education | 543 |
19.7%
|
| 4 | 2nd year of middle education | 462 |
16.7%
|
| 5 | 3rd year of middle education | 336 |
12.2%
|
| 6 | 4th year of middle education | 358 |
13%
|
| Sysmiss | 15 |