| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th year of elementary school | 548 |
38.1%
|
| 2 | 8th year of elementary school | 464 |
32.3%
|
| 3 | 1st grade of high school | 426 |
29.6%
|
| Sysmiss | 8 |