| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
6%
|
|
| 1 | Every few days | 7 |
3.8%
|
| 2 | Every few weeks | 23 |
12.6%
|
| 3 | Every few months | 57 |
31.1%
|
| 4 | Not at all | 57 |
31.1%
|
| Sysmiss | 28 |
15.3%
|