| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 7 | 
                                    
                                    6.1%
                                 | |
| 1 | 8 | 
                                    
                                    7%
                                 | |
| 2 | 8 | 
                                    
                                    7%
                                 | |
| 3 | 19 | 
                                    
                                    16.7%
                                 | |
| 4 | 22 | 
                                    
                                    19.3%
                                 | |
| 5 | 13 | 
                                    
                                    11.4%
                                 | |
| 6 | 7 | 
                                    
                                    6.1%
                                 | |
| 7 | 4 | 
                                    
                                    3.5%
                                 | |
| 8 | 9 | 
                                    
                                    7.9%
                                 | |
| 10 | 4 | 
                                    
                                    3.5%
                                 | |
| 11 | 2 | 
                                    
                                    1.8%
                                 | |
| 12 | 1 | 
                                    
                                    0.9%
                                 | |
| 13 | 1 | 
                                    
                                    0.9%
                                 | |
| 14 | 3 | 
                                    
                                    2.6%
                                 | |
| 15 | 3 | 
                                    
                                    2.6%
                                 | |
| 25 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 2 | 
                                    
                                    1.8%
                                 | |
| Sysmiss | 36 |