| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Per day | 82 |
4.1%
|
| 2 | 2. Per month | 1893 |
93.5%
|
| 3 | 3. Per semester | 3 |
0.1%
|
| 4 | 4 Per academic year | 24 |
1.2%
|
| 5 | 5.Per one school period | 9 |
0.4%
|
| 9 | 13 |
0.6%
|
|
| Sysmiss | 4557 |