| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 4 |
0.1%
|
| 2 | no | 546 |
17.9%
|
| 3 | not possible to observe | 13 |
0.4%
|
| 4 | v.r.: do not exist | 524 |
17.1%
|
| Missing value | 1971 |
64.5%
|