| Value | Category | Cases | |
|---|---|---|---|
| -99 | 7 |
2.3%
|
|
| 1 | Every few days | 8 |
2.6%
|
| 2 | Every few weeks | 53 |
17.2%
|
| 3 | Every few months | 127 |
41.1%
|
| 4 | Not at all | 78 |
25.2%
|
| Sysmiss | 36 |
11.7%
|