| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 8 |
27.6%
|
| 2 | no | 18 |
62.1%
|
| 3 | (dk) | 1 |
3.4%
|
| 4 | (ref) | 2 |
6.9%
|
| Sysmiss | 980 |