| Value | Category | Cases | |
|---|---|---|---|
| -99 | 16 |
7.3%
|
|
| 1 | Every few days | 8 |
3.6%
|
| 2 | Every few weeks | 43 |
19.5%
|
| 3 | Every few months | 76 |
34.5%
|
| 4 | Not at all | 77 |
35%
|
| Sysmiss | 40 |