| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.6%
                                 | 
| 1 | Yes | 58 | 
                                    
                                    37.2%
                                 | 
| 2 | No | 97 | 
                                    
                                    62.2%
                                 | 
| Sysmiss | 59 |