| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    0.6%
                                 | 
| -8 | Refusal (spontaneous) | 2 | 
                                    
                                    0.3%
                                 | 
| 1 | Yes | 28 | 
                                    
                                    4.3%
                                 | 
| 2 | No | 618 | 
                                    
                                    94.8%
                                 | 
| Sysmiss | 372 |