| Value | Category | Cases | |
|---|---|---|---|
| -99 | 14 |
4%
|
|
| 2 | Every few weeks | 22 |
6.3%
|
| 3 | Every few months | 118 |
33.6%
|
| 4 | Not at all | 162 |
46.2%
|
| Sysmiss | 35 |
10%
|