| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 32 | 
                                    
                                    24.6%
                                 | 
| 0 | 5 | 
                                    
                                    3.8%
                                 | |
| 1 | 22 | 
                                    
                                    16.9%
                                 | |
| 2 | 9 | 
                                    
                                    6.9%
                                 | |
| 3 | 11 | 
                                    
                                    8.5%
                                 | |
| 4 | 5 | 
                                    
                                    3.8%
                                 | |
| 5 | 13 | 
                                    
                                    10%
                                 | |
| 7 | 2 | 
                                    
                                    1.5%
                                 | |
| 10 | 7 | 
                                    
                                    5.4%
                                 | |
| 12 | 1 | 
                                    
                                    0.8%
                                 | |
| 15 | 2 | 
                                    
                                    1.5%
                                 | |
| 20 | 6 | 
                                    
                                    4.6%
                                 | |
| 24 | 1 | 
                                    
                                    0.8%
                                 | |
| 30 | 6 | 
                                    
                                    4.6%
                                 | |
| 35 | 2 | 
                                    
                                    1.5%
                                 | |
| 40 | 2 | 
                                    
                                    1.5%
                                 | |
| 45 | 2 | 
                                    
                                    1.5%
                                 | |
| 50 | 2 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 1286 |