| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. per day | 683 |
74.9%
|
| 2 | 2. per month | 219 |
24%
|
| 3 | 3. per semester | 1 |
0.1%
|
| 4 | 4. per academic year | 3 |
0.3%
|
| 5 | 5. per school period | 4 |
0.4%
|
| 9 | 9. Missing | 2 |
0.2%
|
| Sysmiss | 13319 |