| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 239 |
5.3%
|
| 1 | 1. once a year | 540 |
12%
|
| 2 | 2. once a semester | 629 |
14%
|
| 3 | 3. once a term | 2440 |
54.2%
|
| 4 | 4. once a month | 550 |
12.2%
|
| 5 | 5. once a week | 60 |
1.3%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 40 |
0.9%
|
| Sysmiss | 40 |