| Value | Category | Cases | |
|---|---|---|---|
| -99 | 23 |
3.3%
|
|
| 1 | Every few days | 59 |
8.5%
|
| 2 | Every few weeks | 73 |
10.6%
|
| 3 | Every few months | 164 |
23.7%
|
| 4 | Not at all | 372 |
53.8%
|
| Sysmiss | 60 |