| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| 1 | Never or do not compare | 94 |
21.6%
|
| 2 | Once a year or less frequent | 123 |
28.3%
|
| 3 | Two or three times a year | 77 |
17.7%
|
| 4 | Monthly or more often | 139 |
32%
|
| Sysmiss | 975 |