| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.2%
                                 | 
| 1 | Yes | 123 | 
                                    
                                    72.8%
                                 | 
| 2 | No | 44 | 
                                    
                                    26%
                                 | 
| Sysmiss | 142 |