| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    1.2%
                                 | 
| 1 | Yes | 46 | 
                                    
                                    56.1%
                                 | 
| 2 | No | 35 | 
                                    
                                    42.7%
                                 | 
| Sysmiss | 281 |