| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 |
0.8%
|
| 1 | Never or do not compare | 888 |
36.3%
|
| 2 | Once a year or less frequent | 662 |
27.1%
|
| 3 | Two or three times a year | 265 |
10.8%
|
| 4 | Monthly or more often | 613 |
25.1%
|
| Sysmiss | 8225 |