| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 52 |
8.6%
|
| 2 | no | 540 |
89.6%
|
| 3 | (dk) | 2 |
0.3%
|
| 4 | (ref) | 9 |
1.5%
|
| Sysmiss | 399 |