| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. never | 265 |
8.4%
|
| 2 | 2. once a year | 199 |
6.3%
|
| 3 | 3. once a semester | 437 |
13.9%
|
| 4 | 4. once a term | 1773 |
56.4%
|
| 5 | 5. once a month | 360 |
11.4%
|
| 6 | 6. once a week | 111 |
3.5%
|
| Sysmiss | 1393 |