| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    10%
                                 | 
| 0 | None | 33 | 
                                    
                                    47.1%
                                 | 
| 1 | 3 | 
                                    
                                    4.3%
                                 | |
| 2 | 2 | 
                                    
                                    2.9%
                                 | |
| 3 | 1 | 
                                    
                                    1.4%
                                 | |
| 5 | 4 | 
                                    
                                    5.7%
                                 | |
| 8 | 1 | 
                                    
                                    1.4%
                                 | |
| 10 | 4 | 
                                    
                                    5.7%
                                 | |
| 12 | 1 | 
                                    
                                    1.4%
                                 | |
| 15 | 2 | 
                                    
                                    2.9%
                                 | |
| 17 | 1 | 
                                    
                                    1.4%
                                 | |
| 18 | 1 | 
                                    
                                    1.4%
                                 | |
| 20 | 7 | 
                                    
                                    10%
                                 | |
| 25 | 1 | 
                                    
                                    1.4%
                                 | |
| 40 | 1 | 
                                    
                                    1.4%
                                 | |
| 50 | 1 | 
                                    
                                    1.4%
                                 | |
| Sysmiss | 41 |