| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 408 |
13.8%
|
| 2 | Once a year | 258 |
8.7%
|
| 3 | Once a Semester | 364 |
12.3%
|
| 4 | Once a term | 1447 |
48.8%
|
| 5 | Once a month | 420 |
14.2%
|
| 6 | Once a week | 66 |
2.2%
|
| Sysmiss | 364 |