| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    4%
                                 | 
| 1 | Yes | 169 | 
                                    
                                    61.9%
                                 | 
| 2 | No | 93 | 
                                    
                                    34.1%
                                 | 
| Sysmiss | 327 |