| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 22 | 
                                    
                                    8%
                                 | 
| 2 | no | 252 | 
                                    
                                    91.6%
                                 | 
| 3 | (dk) | 1 | 
                                    
                                    0.4%
                                 | 
| 4 | (ref) | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 2725 |