| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
2.1%
|
|
| 1 | Every few days | 31 |
5.9%
|
| 2 | Every few weeks | 110 |
20.9%
|
| 3 | Every few months | 203 |
38.5%
|
| 4 | Not at all | 131 |
24.9%
|
| Sysmiss | 41 |
7.8%
|