| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    7%
                                 | 
| 0 | 24 | 
                                    
                                    27.9%
                                 | |
| 1 | 11 | 
                                    
                                    12.8%
                                 | |
| 2 | 20 | 
                                    
                                    23.3%
                                 | |
| 3 | 5 | 
                                    
                                    5.8%
                                 | |
| 4 | 6 | 
                                    
                                    7%
                                 | |
| 5 | 2 | 
                                    
                                    2.3%
                                 | |
| 6 | 2 | 
                                    
                                    2.3%
                                 | |
| 7 | 1 | 
                                    
                                    1.2%
                                 | |
| 8 | 3 | 
                                    
                                    3.5%
                                 | |
| 9 | 1 | 
                                    
                                    1.2%
                                 | |
| 13 | 1 | 
                                    
                                    1.2%
                                 | |
| 15 | 1 | 
                                    
                                    1.2%
                                 | |
| 17 | 1 | 
                                    
                                    1.2%
                                 | |
| 24 | 1 | 
                                    
                                    1.2%
                                 | |
| 175 | 1 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 129 |