| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
4.1%
|
|
| 1 | Every few days | 31 |
21.1%
|
| 2 | Every few weeks | 32 |
21.8%
|
| 3 | Every few months | 41 |
27.9%
|
| 4 | Not at all | 13 |
8.8%
|
| Sysmiss | 24 |
16.3%
|