| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 30 |
9.3%
|
| 2 | no | 279 |
86.4%
|
| 3 | (dk) | 13 |
4%
|
| 4 | (ref) | 1 |
0.3%
|
| Sysmiss | 679 |