| Value | Category | Cases | |
|---|---|---|---|
| -99 | 16 |
11.3%
|
|
| 1 | Every few days | 13 |
9.2%
|
| 2 | Every few weeks | 34 |
23.9%
|
| 3 | Every few months | 51 |
35.9%
|
| 4 | Not at all | 28 |
19.7%
|
| Sysmiss | 25 |