| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Never | 0 |
0%
|
| 2 | Once a year or less frequent | 14 |
3%
|
| 3 | Two or three times a year | 23 |
4.9%
|
| 4 | Quarterly | 122 |
26.2%
|
| 5 | Monthly or more often | 307 |
65.9%
|
| Sysmiss | 135 |