| Value | Category | Cases | |
|---|---|---|---|
| -99 | 12 |
3.6%
|
|
| 1 | Every few days | 2 |
0.6%
|
| 2 | Every few weeks | 35 |
10.4%
|
| 3 | Every few months | 90 |
26.9%
|
| 4 | Not at all | 146 |
43.6%
|
| Sysmiss | 50 |
14.9%
|