| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1%
|
|
| 1 | Every few days | 28 |
13.6%
|
| 2 | Every few weeks | 48 |
23.3%
|
| 3 | Every few months | 83 |
40.3%
|
| 4 | Not at all | 45 |
21.8%
|
| Sysmiss | 19 |