| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 967 |
47.9%
|
| 2 | Once a year | 163 |
8.1%
|
| 3 | Once a term | 606 |
30%
|
| 4 | Once a month | 137 |
6.8%
|
| 5 | Once a week | 66 |
3.3%
|
| 98 | Other | 79 |
3.9%
|
| Sysmiss | 1309 |