| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 21 | 
                                    
                                    28%
                                 | |
| 1 | 7 | 
                                    
                                    9.3%
                                 | |
| 2 | 8 | 
                                    
                                    10.7%
                                 | |
| 3 | 7 | 
                                    
                                    9.3%
                                 | |
| 4 | 3 | 
                                    
                                    4%
                                 | |
| 5 | 6 | 
                                    
                                    8%
                                 | |
| 6 | 2 | 
                                    
                                    2.7%
                                 | |
| 7 | 2 | 
                                    
                                    2.7%
                                 | |
| 8 | 3 | 
                                    
                                    4%
                                 | |
| 9 | 1 | 
                                    
                                    1.3%
                                 | |
| 10 | 7 | 
                                    
                                    9.3%
                                 | |
| 20 | 1 | 
                                    
                                    1.3%
                                 | |
| 25 | 2 | 
                                    
                                    2.7%
                                 | |
| 30 | 1 | 
                                    
                                    1.3%
                                 | |
| 50 | 1 | 
                                    
                                    1.3%
                                 | |
| 60 | 1 | 
                                    
                                    1.3%
                                 | |
| 100 | 1 | 
                                    
                                    1.3%
                                 | |
| 180 | 1 | 
                                    
                                    1.3%
                                 | |
| Sysmiss | 570 |