| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.6%
                                 | 
| 0 | 271 | 
                                    
                                    87.1%
                                 | |
| 5 | 3 | 
                                    
                                    1%
                                 | |
| 10 | 7 | 
                                    
                                    2.3%
                                 | |
| 20 | 3 | 
                                    
                                    1%
                                 | |
| 30 | 1 | 
                                    
                                    0.3%
                                 | |
| 32 | 1 | 
                                    
                                    0.3%
                                 | |
| 38 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 2 | 
                                    
                                    0.6%
                                 | |
| 45 | 1 | 
                                    
                                    0.3%
                                 | |
| 50 | 3 | 
                                    
                                    1%
                                 | |
| 60 | 2 | 
                                    
                                    0.6%
                                 | |
| 70 | 1 | 
                                    
                                    0.3%
                                 | |
| 78 | 1 | 
                                    
                                    0.3%
                                 | |
| 84 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 2 | 
                                    
                                    0.6%
                                 | |
| 95 | 2 | 
                                    
                                    0.6%
                                 | |
| 100 | 7 | 
                                    
                                    2.3%
                                 |