| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. per day | 12 |
0.6%
|
| 2 | 2. per month | 319 |
15.8%
|
| 3 | 3. per semester | 661 |
32.7%
|
| 4 | 4. per academic year | 816 |
40.4%
|
| 5 | 5. per school period | 213 |
10.5%
|
| 9 | 9. Missing | 1 |
0%
|
| Sysmiss | 12209 |