| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                    
                                    15.1%
                                 | 
| 1 | Yes | 10 | 
                                    
                                    18.9%
                                 | 
| 2 | No | 35 | 
                                    
                                    66%
                                 | 
| Sysmiss | 162 |