| Value | Category | Cases | |
|---|---|---|---|
| -99 | 7 |
2.3%
|
|
| 1 | Every few days | 18 |
5.8%
|
| 2 | Every few weeks | 55 |
17.8%
|
| 3 | Every few months | 128 |
41.4%
|
| 4 | Not at all | 65 |
21%
|
| Sysmiss | 36 |
11.7%
|