| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 400 |
16.8%
|
| 2 | Once a year | 99 |
4.2%
|
| 3 | Once a semester | 207 |
8.7%
|
| 4 | Once a term | 983 |
41.3%
|
| 5 | Once a month | 399 |
16.8%
|
| 6 | Once a week | 101 |
4.2%
|
| 7 | More than once a week | 109 |
4.6%
|
| 98 | Other | 82 |
3.4%
|
| Sysmiss | 947 |