| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                    
                                    5.2%
                                 | 
| 1 | Yes | 119 | 
                                    
                                    69.2%
                                 | 
| 2 | No | 44 | 
                                    
                                    25.6%
                                 | 
| Sysmiss | 783 |