| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 74 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply (sponatneous) | 189 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 239 | 
                                                                 
                                    
                                    15.8%
                                 
                                                             | 
                                                        
                    
| 2 | No | 1010 | 
                                                                 
                                    
                                    66.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1443 |