| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 359 |
15.1%
|
| 2 | Once a year | 100 |
4.2%
|
| 3 | Once a semester | 112 |
4.7%
|
| 4 | Once a term | 993 |
41.7%
|
| 5 | Once a month | 506 |
21.3%
|
| 6 | Once a week | 181 |
7.6%
|
| 7 | More than once a week | 50 |
2.1%
|
| 98 | Other | 79 |
3.3%
|
| Sysmiss | 947 |