| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 266 | 
                                    
                                    8.9%
                                 | 
| 2 | no | 2701 | 
                                    
                                    90%
                                 | 
| 3 | (dk) | 27 | 
                                    
                                    0.9%
                                 | 
| 4 | (ref) | 6 | 
                                    
                                    0.2%
                                 |