| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    0.7%
                                 | 
| -7 | Does not apply (spontaneous) | 3 | 
                                    
                                    0.5%
                                 | 
| 1 | Yes | 78 | 
                                    
                                    13%
                                 | 
| 2 | No | 515 | 
                                    
                                    85.8%
                                 |