| Value | Category | Cases | |
|---|---|---|---|
| -99 | 19 |
5.4%
|
|
| 1 | Every few days | 2 |
0.6%
|
| 2 | Every few weeks | 27 |
7.7%
|
| 3 | Every few months | 168 |
48.1%
|
| 4 | Not at all | 98 |
28.1%
|
| Sysmiss | 35 |
10%
|