| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 48 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    
| 0 | 704 | 
                                                                 
                                    
                                    59.5%
                                 
                                                             | 
                                                        
                    |
| 1 | 128 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    |
| 2 | 79 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 69 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 76 | 
                                                                 
                                    
                                    6.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 10 | 53 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    |
| 11 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 13 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 15 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 335 |