| Value | Category | Cases | |
|---|---|---|---|
| -99 | 10 |
6.8%
|
|
| 1 | Every few days | 5 |
3.4%
|
| 2 | Every few weeks | 13 |
8.8%
|
| 3 | Every few months | 53 |
36.1%
|
| 4 | Not at all | 42 |
28.6%
|
| Sysmiss | 24 |
16.3%
|