| Value | Category | Cases | |
|---|---|---|---|
| -99 | 9 |
6.3%
|
|
| 1 | Every few days | 5 |
3.5%
|
| 2 | Every few weeks | 23 |
16.2%
|
| 3 | Every few months | 65 |
45.8%
|
| 4 | Not at all | 40 |
28.2%
|
| Sysmiss | 25 |