| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.per day | 0 |
0%
|
| 2 | 2.per month | 29 |
18.1%
|
| 3 | 3.per semester | 12 |
7.5%
|
| 4 | 4.per academic year | 71 |
44.4%
|
| 5 | 5. per study period | 47 |
29.4%
|
| 8 | 1 |
0.6%
|
|
| 9 | 9. Missing | 0 |
0%
|
| Sysmiss | 2925 |