| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Per day | 10 |
0.7%
|
| 2 | 2. Per month | 330 |
23.6%
|
| 3 | 3. Per semester | 226 |
16.2%
|
| 4 | 4 Per academic year | 559 |
40%
|
| 5 | 5.Per one school period | 263 |
18.8%
|
| 9 | 10 |
0.7%
|
|
| Sysmiss | 5183 |