| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade of elementary school | 990 |
33.1%
|
| 2 | 8th grade of elementary school | 1051 |
35.2%
|
| 3 | 1st grade of high school | 947 |
31.7%
|
| Sysmiss | 19 |