| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 604 | 
                                    
                                    44.4%
                                 | 
| 1 | Yes, spontaneously | 262 | 
                                    
                                    19.3%
                                 | 
| 2 | Yes, probed | 495 | 
                                    
                                    36.4%
                                 | 
| 8 | Not asked | 0 | 
                                    
                                    0%
                                 |