| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 320 | 
                                    
                                    88.2%
                                 | |
| 3 | 1 | 
                                    
                                    0.3%
                                 | |
| 4 | 1 | 
                                    
                                    0.3%
                                 | |
| 5 | 2 | 
                                    
                                    0.6%
                                 | |
| 10 | 8 | 
                                    
                                    2.2%
                                 | |
| 15 | 2 | 
                                    
                                    0.6%
                                 | |
| 20 | 7 | 
                                    
                                    1.9%
                                 | |
| 25 | 2 | 
                                    
                                    0.6%
                                 | |
| 30 | 7 | 
                                    
                                    1.9%
                                 | |
| 35 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 4 | 
                                    
                                    1.1%
                                 | |
| 50 | 2 | 
                                    
                                    0.6%
                                 | |
| 60 | 2 | 
                                    
                                    0.6%
                                 | |
| 80 | 3 | 
                                    
                                    0.8%
                                 | |
| 99 | 1 | 
                                    
                                    0.3%
                                 |