| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    3.7%
                                 | 
| 1 | Yes | 37 | 
                                    
                                    45.1%
                                 | 
| 2 | No | 42 | 
                                    
                                    51.2%
                                 | 
| Sysmiss | 530 |