| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1%
|
|
| 1 | Every few days | 8 |
3.9%
|
| 2 | Every few weeks | 42 |
20.5%
|
| 3 | Every few months | 95 |
46.3%
|
| 4 | Not at all | 58 |
28.3%
|
| Sysmiss | 20 |