| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.8%
|
|
| 1 | Every few days | 9 |
7.4%
|
| 2 | Every few weeks | 21 |
17.2%
|
| 3 | Every few months | 46 |
37.7%
|
| 4 | Not at all | 45 |
36.9%
|
| Sysmiss | 22 |