| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 98 | 
                                                                 
                                    
                                    37.4%
                                 
                                                             | 
                                                        
                    
| 0 | 44 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    |
| 1 | 26 | 
                                                                 
                                    
                                    9.9%
                                 
                                                             | 
                                                        
                    |
| 2 | 35 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 20 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 13 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 7 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 10 | 9 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 15 | 8 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 45 |