| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    10.3%
                                 | 
| 1 | Yes | 37 | 
                                    
                                    63.8%
                                 | 
| 2 | No | 15 | 
                                    
                                    25.9%
                                 | 
| Sysmiss | 53 |