| Value | Category | Cases | |
|---|---|---|---|
| -99 | 36 |
9.1%
|
|
| 1 | Every few days | 23 |
5.8%
|
| 2 | Every few weeks | 53 |
13.4%
|
| 3 | Every few months | 139 |
35.2%
|
| 4 | Not at all | 63 |
15.9%
|
| Sysmiss | 81 |
20.5%
|