| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                                                 
                                    
                                    23.4%
                                 
                                                             | 
                                                        
                    
| 0 | 19 | 
                                                                 
                                    
                                    40.4%
                                 
                                                             | 
                                                        
                    |
| 1 | 6 | 
                                                                 
                                    
                                    12.8%
                                 
                                                             | 
                                                        
                    |
| 2 | 2 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 10 | 3 | 
                                                                 
                                    
                                    6.4%
                                 
                                                             | 
                                                        
                    |
| 50 | 2 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 105 |