| Value | Category | Cases | |
|---|---|---|---|
| -99 | 20 |
9.1%
|
|
| 1 | Every few days | 8 |
3.6%
|
| 2 | Every few weeks | 51 |
23.2%
|
| 3 | Every few months | 67 |
30.5%
|
| 4 | Not at all | 74 |
33.6%
|
| Sysmiss | 40 |