| Value | Category | Cases | |
|---|---|---|---|
| -99 | 19 |
5.4%
|
|
| 1 | Every few days | 6 |
1.7%
|
| 2 | Every few weeks | 29 |
8.3%
|
| 3 | Every few months | 87 |
24.9%
|
| 4 | Not at all | 174 |
49.9%
|
| Sysmiss | 34 |
9.7%
|