| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 254 |
9.3%
|
| 2 | Once a year | 4 |
0.1%
|
| 3 | Once a Semester | 64 |
2.3%
|
| 4 | Once a term | 330 |
12.1%
|
| 5 | Once a month | 556 |
20.3%
|
| 6 | Once a week | 1526 |
55.8%
|
| Sysmiss | 593 |