| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
3.3%
|
|
| 1 | Every few days | 8 |
6.6%
|
| 2 | Every few weeks | 27 |
22.3%
|
| 3 | Every few months | 40 |
33.1%
|
| 4 | Not at all | 42 |
34.7%
|
| Sysmiss | 23 |