| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    15.2%
                                 | 
| 1 | Yes | 11 | 
                                    
                                    23.9%
                                 | 
| 2 | No | 28 | 
                                    
                                    60.9%
                                 | 
| Sysmiss | 51 |