| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                    
                                    1.7%
                                 | 
| 1 | Yes | 201 | 
                                    
                                    68.4%
                                 | 
| 2 | No | 88 | 
                                    
                                    29.9%
                                 | 
| Sysmiss | 108 |