| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 122 | 
                                    
                                    46%
                                 | 
| 0 | 9 | 
                                    
                                    3.4%
                                 | |
| 1 | 11 | 
                                    
                                    4.2%
                                 | |
| 2 | 14 | 
                                    
                                    5.3%
                                 | |
| 3 | 9 | 
                                    
                                    3.4%
                                 | |
| 4 | 7 | 
                                    
                                    2.6%
                                 | |
| 5 | 15 | 
                                    
                                    5.7%
                                 | |
| 6 | 6 | 
                                    
                                    2.3%
                                 | |
| 7 | 6 | 
                                    
                                    2.3%
                                 | |
| 8 | 7 | 
                                    
                                    2.6%
                                 | |
| 9 | 3 | 
                                    
                                    1.1%
                                 | |
| 10 | 21 | 
                                    
                                    7.9%
                                 | |
| 12 | 6 | 
                                    
                                    2.3%
                                 | |
| 13 | 1 | 
                                    
                                    0.4%
                                 | |
| 15 | 11 | 
                                    
                                    4.2%
                                 | |
| 16 | 2 | 
                                    
                                    0.8%
                                 | |
| 17 | 2 | 
                                    
                                    0.8%
                                 | |
| 20 | 5 | 
                                    
                                    1.9%
                                 | |
| 22 | 1 | 
                                    
                                    0.4%
                                 | |
| 23 | 1 | 
                                    
                                    0.4%
                                 | |
| 25 | 2 | 
                                    
                                    0.8%
                                 | |
| 28 | 1 | 
                                    
                                    0.4%
                                 | |
| 50 | 2 | 
                                    
                                    0.8%
                                 | |
| 65 | 1 | 
                                    
                                    0.4%
                                 | |
| Sysmiss | 2432 |