| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 | 
                                    
                                    5.9%
                                 | 
| 1 | Yes | 138 | 
                                    
                                    37%
                                 | 
| 2 | No | 213 | 
                                    
                                    57.1%
                                 | 
| Sysmiss | 239 |