| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
0.9%
|
|
| 1 | Every few days | 25 |
7.1%
|
| 2 | Every few weeks | 67 |
19.1%
|
| 3 | Every few months | 169 |
48.1%
|
| 4 | Not at all | 59 |
16.8%
|
| Sysmiss | 28 |
8%
|