| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 721 |
24.3%
|
| 2 | Once a year | 191 |
6.4%
|
| 3 | Once a Semester | 130 |
4.4%
|
| 4 | Once a term | 848 |
28.6%
|
| 5 | Once a month | 654 |
22.1%
|
| 6 | Once a week | 419 |
14.1%
|
| Sysmiss | 364 |