| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade (basic education) | 515 |
17.4%
|
| 2 | 8th grade (basic education) | 655 |
22.2%
|
| 3 | 1st year of middle education | 490 |
16.6%
|
| 4 | 2nd year of middle education | 425 |
14.4%
|
| 5 | 3rd year of middle education | 432 |
14.6%
|
| 6 | 4th year of middle education | 440 |
14.9%
|
| Sysmiss | 18 |