| Value | Category | Cases | |
|---|---|---|---|
| -99 | 25 |
11.4%
|
|
| 1 | Every few days | 8 |
3.6%
|
| 2 | Every few weeks | 26 |
11.8%
|
| 3 | Every few months | 59 |
26.8%
|
| 4 | Not at all | 102 |
46.4%
|
| Sysmiss | 40 |