| Value | Category | Cases | |
|---|---|---|---|
| -99 | 10 |
3.9%
|
|
| 1 | Every few days | 2 |
0.8%
|
| 2 | Every few weeks | 35 |
13.7%
|
| 3 | Every few months | 95 |
37.1%
|
| 4 | Not at all | 80 |
31.3%
|
| Sysmiss | 34 |
13.3%
|