| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.6%
                                 | 
| 0 | 57 | 
                                    
                                    46.7%
                                 | |
| 1 | 14 | 
                                    
                                    11.5%
                                 | |
| 2 | 23 | 
                                    
                                    18.9%
                                 | |
| 3 | 7 | 
                                    
                                    5.7%
                                 | |
| 5 | 5 | 
                                    
                                    4.1%
                                 | |
| 6 | 1 | 
                                    
                                    0.8%
                                 | |
| 7 | 3 | 
                                    
                                    2.5%
                                 | |
| 8 | 2 | 
                                    
                                    1.6%
                                 | |
| 10 | 1 | 
                                    
                                    0.8%
                                 | |
| 14 | 1 | 
                                    
                                    0.8%
                                 | |
| 15 | 1 | 
                                    
                                    0.8%
                                 | |
| 16 | 1 | 
                                    
                                    0.8%
                                 | |
| 18 | 2 | 
                                    
                                    1.6%
                                 | |
| 25 | 1 | 
                                    
                                    0.8%
                                 | |
| 30 | 1 | 
                                    
                                    0.8%
                                 | |
| Sysmiss | 241 |