| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 12 |
2.5%
|
| 2 | no | 461 |
95.2%
|
| 3 | (dk) | 10 |
2.1%
|
| 4 | (ref) | 1 |
0.2%
|
| Sysmiss | 516 |