| Value | Category | Cases | |
|---|---|---|---|
| -99 | 20 |
2.9%
|
|
| 1 | Every few days | 37 |
5.4%
|
| 2 | Every few weeks | 91 |
13.2%
|
| 3 | Every few months | 271 |
39.2%
|
| 4 | Not at all | 272 |
39.4%
|
| Sysmiss | 60 |