| Value | Category | Cases | |
|---|---|---|---|
| -99 | 5 |
1.9%
|
|
| 1 | Every few days | 2 |
0.8%
|
| 2 | Every few weeks | 16 |
6.1%
|
| 3 | Every few months | 97 |
37.2%
|
| 4 | Not at all | 91 |
34.9%
|
| Sysmiss | 50 |
19.2%
|