| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    
| 0 | 202 | 
                                                                 
                                    
                                    68.7%
                                 
                                                             | 
                                                        
                    |
| 1 | 63 | 
                                                                 
                                    
                                    21.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 9 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 3 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 4 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 5 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 10 | 2 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 70 |