| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
2.5%
|
|
| 1 | Every few days | 6 |
4.9%
|
| 2 | Every few weeks | 6 |
4.9%
|
| 3 | Every few months | 37 |
30.3%
|
| 4 | Not at all | 70 |
57.4%
|
| Sysmiss | 22 |