| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 138 |
20%
|
| 2 | no | 536 |
77.7%
|
| 3 | (dk) | 14 |
2%
|
| 4 | (ref) | 2 |
0.3%
|
| Sysmiss | 310 |