| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
2.5%
|
|
| 1 | Every few days | 15 |
12.3%
|
| 2 | Every few weeks | 35 |
28.7%
|
| 3 | Every few months | 48 |
39.3%
|
| 4 | Not at all | 21 |
17.2%
|
| Sysmiss | 22 |