| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
2.5%
|
|
| 1 | Every few days | 6 |
5%
|
| 2 | Every few weeks | 8 |
6.6%
|
| 3 | Every few months | 41 |
33.9%
|
| 4 | Not at all | 63 |
52.1%
|
| Sysmiss | 23 |