| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 1 | 
                                    
                                    33.3%
                                 | 
| -8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 0 | 1 | 
                                    
                                    33.3%
                                 | |
| 5 | 1 | 
                                    
                                    33.3%
                                 | |
| Sysmiss | 952 |