| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. every week | 660 |
20.4%
|
| 2 | 2. every month | 1031 |
31.9%
|
| 3 | 3. every term | 757 |
23.4%
|
| 4 | 4. every semester | 147 |
4.5%
|
| 5 | 5. once | 332 |
10.3%
|
| 6 | 6. never | 309 |
9.5%
|
| Sysmiss | 1302 |