| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    
| 0 | 4 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 4 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 10 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 20 | 5 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 35 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 40 | 5 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 45 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 50 | 7 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 55 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 65 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 68 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 75 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 80 | 4 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 85 | 3 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 90 | 4 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 95 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 100 | 122 | 
                                                                 
                                    
                                    63.9%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 50 |