| Value | Category | Cases | |
|---|---|---|---|
| -99 | 5 |
3.2%
|
|
| 1 | Every few days | 7 |
4.4%
|
| 2 | Every few weeks | 29 |
18.4%
|
| 3 | Every few months | 58 |
36.7%
|
| 4 | Not at all | 39 |
24.7%
|
| Sysmiss | 20 |
12.7%
|