| Value | Category | Cases | |
|---|---|---|---|
| -99 | 8 |
2.3%
|
|
| 1 | Every few days | 14 |
4%
|
| 2 | Every few weeks | 73 |
20.8%
|
| 3 | Every few months | 154 |
43.9%
|
| 4 | Not at all | 73 |
20.8%
|
| Sysmiss | 29 |
8.3%
|