| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th year of elementary school | 576 |
37.9%
|
| 2 | 8th year of elementary school | 346 |
22.8%
|
| 3 | 1st grade of high school | 597 |
39.3%
|
| Sysmiss | 41 |