| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 | 
                                    
                                    27.3%
                                 | 
| -8 | Refusal (spontaneous) | 32 | 
                                    
                                    72.7%
                                 | 
| Sysmiss | 285 |