| Value | Category | Cases | |
|---|---|---|---|
| -99 | 14 |
4%
|
|
| 1 | Every few days | 1 |
0.3%
|
| 2 | Every few weeks | 15 |
4.3%
|
| 3 | Every few months | 72 |
20.6%
|
| 4 | Not at all | 205 |
58.7%
|
| Sysmiss | 42 |
12%
|