| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 28 | 
                                    
                                    3.8%
                                 | 
| 1 | Yes | 340 | 
                                    
                                    45.9%
                                 | 
| 2 | No | 373 | 
                                    
                                    50.3%
                                 | 
| Sysmiss | 675 |