| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
4.1%
|
|
| 1 | Every few days | 23 |
15.6%
|
| 2 | Every few weeks | 33 |
22.4%
|
| 3 | Every few months | 40 |
27.2%
|
| 4 | Not at all | 21 |
14.3%
|
| Sysmiss | 24 |
16.3%
|