| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                                                 
                                    
                                    36.4%
                                 
                                                             | 
                                                        
                    
| 5 | 1 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 18 | 1 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 25 | 2 | 
                                                                 
                                    
                                    18.2%
                                 
                                                             | 
                                                        
                    |
| 29 | 1 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 1205 |