| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
4.8%
|
| 1 | Never or do not compare | 10 |
23.8%
|
| 2 | Once a year or less frequent | 9 |
21.4%
|
| 3 | Two or three times a year | 8 |
19%
|
| 4 | Monthly or more often | 13 |
31%
|
| Sysmiss | 55 |