| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
2.3%
|
|
| 1 | Every few days | 15 |
5.9%
|
| 2 | Every few weeks | 55 |
21.5%
|
| 3 | Every few months | 86 |
33.6%
|
| 4 | Not at all | 64 |
25%
|
| Sysmiss | 30 |
11.7%
|