| Value | Category | Cases | |
|---|---|---|---|
| -99 | 12 |
3.9%
|
|
| 1 | Every few days | 4 |
1.3%
|
| 2 | Every few weeks | 28 |
9.1%
|
| 3 | Every few months | 90 |
29.1%
|
| 4 | Not at all | 139 |
45%
|
| Sysmiss | 36 |
11.7%
|