| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
3.1%
|
|
| 1 | Every few days | 9 |
2.6%
|
| 2 | Every few weeks | 27 |
7.7%
|
| 3 | Every few months | 87 |
24.8%
|
| 4 | Not at all | 184 |
52.4%
|
| Sysmiss | 33 |
9.4%
|