| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 60 |
14.2%
|
| 1 | Never or do not compare | 263 |
62.2%
|
| 2 | Once a year or less frequent | 59 |
13.9%
|
| 3 | Two or three times a year | 27 |
6.4%
|
| 4 | Monthly or more often | 14 |
3.3%
|
| Sysmiss | 1336 |