| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Yes | 24 | 
                                    
                                    6%
                                 | 
| 2 | No | 378 | 
                                    
                                    94%
                                 |