| Value | Category | Cases | |
|---|---|---|---|
| -99 | 22 |
3.2%
|
|
| 1 | Every few days | 34 |
4.9%
|
| 2 | Every few weeks | 74 |
10.7%
|
| 3 | Every few months | 217 |
31.4%
|
| 4 | Not at all | 344 |
49.8%
|
| Sysmiss | 60 |