| Value | Category | Cases | |
|---|---|---|---|
| -99 | 15 |
10.6%
|
|
| 1 | Every few days | 5 |
3.5%
|
| 2 | Every few weeks | 21 |
14.8%
|
| 3 | Every few months | 46 |
32.4%
|
| 4 | Not at all | 55 |
38.7%
|
| Sysmiss | 25 |