| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
6%
|
|
| 1 | Every few days | 8 |
4.4%
|
| 2 | Every few weeks | 20 |
10.9%
|
| 3 | Every few months | 61 |
33.3%
|
| 4 | Not at all | 55 |
30.1%
|
| Sysmiss | 28 |
15.3%
|