| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    5.7%
                                 | 
| 1 | Yes | 24 | 
                                    
                                    68.6%
                                 | 
| 2 | No | 9 | 
                                    
                                    25.7%
                                 | 
| Sysmiss | 76 |