| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 13 |
36.1%
|
| 2 | no | 12 |
33.3%
|
| 3 | (dk) | 5 |
13.9%
|
| 4 | (ref) | 6 |
16.7%
|
| Sysmiss | 973 |