| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    5%
                                 | 
| 1 | Yes | 11 | 
                                    
                                    9.2%
                                 | 
| 2 | No | 102 | 
                                    
                                    85.7%
                                 | 
| Sysmiss | 836 |