| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
2.3%
|
|
| 1 | Every few days | 1 |
0.4%
|
| 2 | Every few weeks | 10 |
3.8%
|
| 3 | Every few months | 112 |
42.9%
|
| 4 | Not at all | 82 |
31.4%
|
| Sysmiss | 50 |
19.2%
|