| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    2%
                                 | 
| 0 | 6 | 
                                    
                                    4%
                                 | |
| 1 | 17 | 
                                    
                                    11.3%
                                 | |
| 2 | 12 | 
                                    
                                    8%
                                 | |
| 3 | 15 | 
                                    
                                    10%
                                 | |
| 4 | 23 | 
                                    
                                    15.3%
                                 | |
| 5 | 20 | 
                                    
                                    13.3%
                                 | |
| 6 | 10 | 
                                    
                                    6.7%
                                 | |
| 7 | 1 | 
                                    
                                    0.7%
                                 | |
| 8 | 6 | 
                                    
                                    4%
                                 | |
| 10 | 10 | 
                                    
                                    6.7%
                                 | |
| 11 | 2 | 
                                    
                                    1.3%
                                 | |
| 12 | 4 | 
                                    
                                    2.7%
                                 | |
| 13 | 4 | 
                                    
                                    2.7%
                                 | |
| 14 | 1 | 
                                    
                                    0.7%
                                 | |
| 15 | 1 | 
                                    
                                    0.7%
                                 | |
| 18 | 4 | 
                                    
                                    2.7%
                                 | |
| 20 | 2 | 
                                    
                                    1.3%
                                 | |
| 25 | 2 | 
                                    
                                    1.3%
                                 | |
| 28 | 1 | 
                                    
                                    0.7%
                                 | |
| 30 | 2 | 
                                    
                                    1.3%
                                 | |
| 55 | 1 | 
                                    
                                    0.7%
                                 | |
| 60 | 1 | 
                                    
                                    0.7%
                                 | |
| 65 | 1 | 
                                    
                                    0.7%
                                 | |
| 90 | 1 | 
                                    
                                    0.7%
                                 |