| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
3.3%
|
|
| 1 | Every few days | 8 |
2.4%
|
| 2 | Every few weeks | 60 |
17.9%
|
| 3 | Every few months | 162 |
48.4%
|
| 4 | Not at all | 44 |
13.1%
|
| Sysmiss | 50 |
14.9%
|