| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 | 
                                    
                                    4%
                                 | 
| 0 | 106 | 
                                    
                                    42.1%
                                 | |
| 1 | 37 | 
                                    
                                    14.7%
                                 | |
| 2 | 30 | 
                                    
                                    11.9%
                                 | |
| 3 | 15 | 
                                    
                                    6%
                                 | |
| 4 | 9 | 
                                    
                                    3.6%
                                 | |
| 5 | 11 | 
                                    
                                    4.4%
                                 | |
| 6 | 2 | 
                                    
                                    0.8%
                                 | |
| 7 | 1 | 
                                    
                                    0.4%
                                 | |
| 8 | 3 | 
                                    
                                    1.2%
                                 | |
| 10 | 4 | 
                                    
                                    1.6%
                                 | |
| 11 | 1 | 
                                    
                                    0.4%
                                 | |
| 12 | 2 | 
                                    
                                    0.8%
                                 | |
| 13 | 1 | 
                                    
                                    0.4%
                                 | |
| 15 | 1 | 
                                    
                                    0.4%
                                 | |
| 20 | 3 | 
                                    
                                    1.2%
                                 | |
| 25 | 2 | 
                                    
                                    0.8%
                                 | |
| 30 | 2 | 
                                    
                                    0.8%
                                 | |
| 40 | 3 | 
                                    
                                    1.2%
                                 | |
| 41 | 1 | 
                                    
                                    0.4%
                                 | |
| 45 | 1 | 
                                    
                                    0.4%
                                 | |
| 49 | 1 | 
                                    
                                    0.4%
                                 | |
| 50 | 1 | 
                                    
                                    0.4%
                                 | |
| 56 | 1 | 
                                    
                                    0.4%
                                 | |
| 68 | 1 | 
                                    
                                    0.4%
                                 | |
| 80 | 1 | 
                                    
                                    0.4%
                                 | |
| 100 | 1 | 
                                    
                                    0.4%
                                 | |
| 200 | 1 | 
                                    
                                    0.4%
                                 | |
| Sysmiss | 703 |