| Value | Category | Cases | |
|---|---|---|---|
| -99 | 16 |
11.3%
|
|
| 1 | Every few days | 15 |
10.6%
|
| 2 | Every few weeks | 21 |
14.8%
|
| 3 | Every few months | 64 |
45.1%
|
| 4 | Not at all | 26 |
18.3%
|
| Sysmiss | 25 |