| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 | 
                                    
                                    0.7%
                                 | 
| -7 | Does not apply (spontaneous) | 32 | 
                                    
                                    2.3%
                                 | 
| 1 | Yes | 66 | 
                                    
                                    4.7%
                                 | 
| 2 | No | 1308 | 
                                    
                                    92.4%
                                 |