| Value | Category | Cases | |
|---|---|---|---|
| -99 | 77 |
26.9%
|
|
| 1 | Every few days | 15 |
5.2%
|
| 2 | Every few weeks | 21 |
7.3%
|
| 3 | Every few months | 38 |
13.3%
|
| 4 | Not at all | 135 |
47.2%
|
| Sysmiss | 89 |