| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    3%
                                 | 
| 1 | Yes | 66 | 
                                    
                                    66%
                                 | 
| 2 | No | 31 | 
                                    
                                    31%
                                 | 
| Sysmiss | 115 |