| Value | Category | Cases | |
|---|---|---|---|
| -99 | 17 |
7.7%
|
|
| 1 | Every few days | 16 |
7.3%
|
| 2 | Every few weeks | 59 |
26.8%
|
| 3 | Every few months | 78 |
35.5%
|
| 4 | Not at all | 50 |
22.7%
|
| Sysmiss | 40 |