| Value | Category | Cases | |
|---|---|---|---|
| -99 | 22 |
3.2%
|
|
| 1 | Every few days | 106 |
15.3%
|
| 2 | Every few weeks | 130 |
18.8%
|
| 3 | Every few months | 198 |
28.7%
|
| 4 | Not at all | 235 |
34%
|
| Sysmiss | 60 |