| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 210 |
8.8%
|
| 2 | Once a year | 25 |
1.1%
|
| 3 | Once a semester | 112 |
4.7%
|
| 4 | Once a term | 660 |
27.7%
|
| 5 | Once a month | 678 |
28.5%
|
| 6 | Once a week | 320 |
13.4%
|
| 7 | More than once a week | 212 |
8.9%
|
| 98 | Other | 163 |
6.8%
|
| Sysmiss | 947 |