| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 36 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 45 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             | 
                                                        
                    
| 2 | No | 1332 | 
                                                                 
                                    
                                    94.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 33 |