| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| 1 | Never or do not compare | 49 |
9.7%
|
| 2 | Once a year or less frequent | 172 |
33.9%
|
| 3 | Two or three times a year | 120 |
23.7%
|
| 4 | Monthly or more often | 165 |
32.5%
|
| Sysmiss | 491 |