| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
3.3%
|
|
| 1 | Every few days | 4 |
3.3%
|
| 2 | Every few weeks | 20 |
16.3%
|
| 3 | Every few months | 42 |
34.1%
|
| 4 | Not at all | 53 |
43.1%
|
| Sysmiss | 21 |