| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    0.4%
                                 | 
| -8 | Refusal (spontaneous) | 4 | 
                                    
                                    0.5%
                                 | 
| 1 | Yes | 9 | 
                                    
                                    1.2%
                                 | 
| 2 | No | 763 | 
                                    
                                    97.9%
                                 | 
| Sysmiss | 637 |