| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Every few days | 21 |
10.1%
|
| 2 | Every few weeks | 73 |
35.1%
|
| 3 | Every few months | 92 |
44.2%
|
| 4 | Not at all | 21 |
10.1%
|
| Sysmiss | 17 |