| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    1.6%
                                 | 
| 1 | Yes | 161 | 
                                    
                                    44.2%
                                 | 
| 2 | No | 197 | 
                                    
                                    54.1%
                                 | 
| Sysmiss | 1052 |