| Value | Category | Cases | |
|---|---|---|---|
| 1 | 8th grade of Primary School or 1st year of High School | 968 |
36.5%
|
| 2 | 9th grade of Primary School or 2nd year of High School | 815 |
30.8%
|
| 3 | 1st year of Primary School or 3rd year of High School | 866 |
32.7%
|
| Sysmiss | 140 |