| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade (basic education) | 514 |
20.3%
|
| 2 | 8th grade (basic education) | 619 |
24.5%
|
| 3 | 1st year of middle education | 395 |
15.6%
|
| 4 | 2nd year of middle education | 350 |
13.8%
|
| 5 | 3rd year of middle education | 341 |
13.5%
|
| 6 | 4th year of middle education | 312 |
12.3%
|
| Sysmiss | 19 |