| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
1.5%
|
|
| 1 | Every few days | 4 |
1.5%
|
| 2 | Every few weeks | 39 |
14.9%
|
| 3 | Every few months | 104 |
39.8%
|
| 4 | Not at all | 60 |
23%
|
| Sysmiss | 50 |
19.2%
|