| Value | Category | Cases | |
|---|---|---|---|
| -99 | 9 |
2.9%
|
|
| 1 | Every few days | 2 |
0.6%
|
| 2 | Every few weeks | 23 |
7.4%
|
| 3 | Every few months | 62 |
20.1%
|
| 4 | Not at all | 177 |
57.3%
|
| Sysmiss | 36 |
11.7%
|