| Value | Category | Cases | |
|---|---|---|---|
| -99 | 22 |
4.2%
|
|
| 1 | Every few days | 26 |
4.9%
|
| 2 | Every few weeks | 98 |
18.6%
|
| 3 | Every few months | 196 |
37.2%
|
| 4 | Not at all | 141 |
26.8%
|
| Sysmiss | 44 |
8.3%
|