| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 | 
                                    
                                    9%
                                 | 
| 0 | 35 | 
                                    
                                    31.5%
                                 | |
| 1 | 13 | 
                                    
                                    11.7%
                                 | |
| 2 | 14 | 
                                    
                                    12.6%
                                 | |
| 3 | 9 | 
                                    
                                    8.1%
                                 | |
| 4 | 8 | 
                                    
                                    7.2%
                                 | |
| 5 | 1 | 
                                    
                                    0.9%
                                 | |
| 6 | 3 | 
                                    
                                    2.7%
                                 | |
| 7 | 1 | 
                                    
                                    0.9%
                                 | |
| 8 | 1 | 
                                    
                                    0.9%
                                 | |
| 9 | 2 | 
                                    
                                    1.8%
                                 | |
| 10 | 1 | 
                                    
                                    0.9%
                                 | |
| 11 | 1 | 
                                    
                                    0.9%
                                 | |
| 12 | 1 | 
                                    
                                    0.9%
                                 | |
| 13 | 1 | 
                                    
                                    0.9%
                                 | |
| 15 | 1 | 
                                    
                                    0.9%
                                 | |
| 18 | 1 | 
                                    
                                    0.9%
                                 | |
| 20 | 3 | 
                                    
                                    2.7%
                                 | |
| 21 | 1 | 
                                    
                                    0.9%
                                 | |
| 23 | 1 | 
                                    
                                    0.9%
                                 | |
| 32 | 1 | 
                                    
                                    0.9%
                                 | |
| 40 | 1 | 
                                    
                                    0.9%
                                 | |
| 81 | 1 | 
                                    
                                    0.9%
                                 |