| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 40 | 
                                    
                                    14.9%
                                 | 
| 0 | 31 | 
                                    
                                    11.6%
                                 | |
| 1 | 51 | 
                                    
                                    19%
                                 | |
| 2 | 27 | 
                                    
                                    10.1%
                                 | |
| 3 | 39 | 
                                    
                                    14.6%
                                 | |
| 4 | 11 | 
                                    
                                    4.1%
                                 | |
| 5 | 22 | 
                                    
                                    8.2%
                                 | |
| 6 | 3 | 
                                    
                                    1.1%
                                 | |
| 7 | 3 | 
                                    
                                    1.1%
                                 | |
| 8 | 6 | 
                                    
                                    2.2%
                                 | |
| 10 | 16 | 
                                    
                                    6%
                                 | |
| 11 | 1 | 
                                    
                                    0.4%
                                 | |
| 12 | 1 | 
                                    
                                    0.4%
                                 | |
| 14 | 1 | 
                                    
                                    0.4%
                                 | |
| 15 | 3 | 
                                    
                                    1.1%
                                 | |
| 20 | 3 | 
                                    
                                    1.1%
                                 | |
| 30 | 3 | 
                                    
                                    1.1%
                                 | |
| 34 | 1 | 
                                    
                                    0.4%
                                 | |
| 35 | 2 | 
                                    
                                    0.7%
                                 | |
| 40 | 1 | 
                                    
                                    0.4%
                                 | |
| 50 | 2 | 
                                    
                                    0.7%
                                 | |
| 55 | 1 | 
                                    
                                    0.4%
                                 | |
| Sysmiss | 344 |