| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    1%
                                 | 
| 0 | 224 | 
                                    
                                    55.7%
                                 | |
| 1 | 67 | 
                                    
                                    16.7%
                                 | |
| 2 | 35 | 
                                    
                                    8.7%
                                 | |
| 3 | 17 | 
                                    
                                    4.2%
                                 | |
| 4 | 5 | 
                                    
                                    1.2%
                                 | |
| 5 | 7 | 
                                    
                                    1.7%
                                 | |
| 6 | 9 | 
                                    
                                    2.2%
                                 | |
| 7 | 3 | 
                                    
                                    0.7%
                                 | |
| 8 | 3 | 
                                    
                                    0.7%
                                 | |
| 9 | 1 | 
                                    
                                    0.2%
                                 | |
| 10 | 8 | 
                                    
                                    2%
                                 | |
| 14 | 1 | 
                                    
                                    0.2%
                                 | |
| 15 | 1 | 
                                    
                                    0.2%
                                 | |
| 17 | 1 | 
                                    
                                    0.2%
                                 | |
| 18 | 2 | 
                                    
                                    0.5%
                                 | |
| 20 | 1 | 
                                    
                                    0.2%
                                 | |
| 21 | 1 | 
                                    
                                    0.2%
                                 | |
| 22 | 1 | 
                                    
                                    0.2%
                                 | |
| 25 | 1 | 
                                    
                                    0.2%
                                 | |
| 28 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 1 | 
                                    
                                    0.2%
                                 | |
| 32 | 1 | 
                                    
                                    0.2%
                                 | |
| 34 | 1 | 
                                    
                                    0.2%
                                 | |
| 35 | 2 | 
                                    
                                    0.5%
                                 | |
| 47 | 1 | 
                                    
                                    0.2%
                                 | |
| 50 | 1 | 
                                    
                                    0.2%
                                 | |
| 52 | 1 | 
                                    
                                    0.2%
                                 | |
| 100 | 1 | 
                                    
                                    0.2%
                                 |