| Value | Category | Cases | |
|---|---|---|---|
| -99 | 5 |
1.9%
|
|
| 1 | Every few days | 2 |
0.8%
|
| 2 | Every few weeks | 37 |
14.2%
|
| 3 | Every few months | 80 |
30.7%
|
| 4 | Not at all | 87 |
33.3%
|
| Sysmiss | 50 |
19.2%
|