| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
3.8%
|
|
| 1 | Every few days | 5 |
3.2%
|
| 2 | Every few weeks | 9 |
5.7%
|
| 3 | Every few months | 38 |
24.1%
|
| 4 | Not at all | 80 |
50.6%
|
| Sysmiss | 20 |
12.7%
|