| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 3 | 
                                    
                                    4.5%
                                 | |
| 8 | 1 | 
                                    
                                    1.5%
                                 | |
| 10 | 1 | 
                                    
                                    1.5%
                                 | |
| 15 | 1 | 
                                    
                                    1.5%
                                 | |
| 20 | 3 | 
                                    
                                    4.5%
                                 | |
| 30 | 2 | 
                                    
                                    3%
                                 | |
| 40 | 2 | 
                                    
                                    3%
                                 | |
| 45 | 1 | 
                                    
                                    1.5%
                                 | |
| 50 | 8 | 
                                    
                                    11.9%
                                 | |
| 55 | 1 | 
                                    
                                    1.5%
                                 | |
| 70 | 1 | 
                                    
                                    1.5%
                                 | |
| 74 | 1 | 
                                    
                                    1.5%
                                 | |
| 77 | 1 | 
                                    
                                    1.5%
                                 | |
| 80 | 1 | 
                                    
                                    1.5%
                                 | |
| 82 | 1 | 
                                    
                                    1.5%
                                 | |
| 85 | 1 | 
                                    
                                    1.5%
                                 | |
| 100 | 38 | 
                                    
                                    56.7%
                                 | |
| Sysmiss | 297 |