| Value | Category | Cases | |
|---|---|---|---|
| -99 | 24 |
4.6%
|
|
| 1 | Every few days | 13 |
2.5%
|
| 2 | Every few weeks | 73 |
13.9%
|
| 3 | Every few months | 186 |
35.3%
|
| 4 | Not at all | 178 |
33.8%
|
| Sysmiss | 53 |
10.1%
|