| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                    
                                    2%
                                 | 
| 1 | Yes | 239 | 
                                    
                                    59.6%
                                 | 
| 2 | No | 154 | 
                                    
                                    38.4%
                                 | 
| Sysmiss | 554 |