| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 39 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply (spontaneous) | 56 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 316 | 
                                                                 
                                    
                                    22.4%
                                 
                                                             | 
                                                        
                    
| 2 | No | 1002 | 
                                                                 
                                    
                                    70.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 33 |