| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Yes | 2 | 
                                    
                                    16.7%
                                 | 
| 2 | No | 10 | 
                                    
                                    83.3%
                                 | 
| Sysmiss | 138 |