| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.5%
                                 | 
| 1 | Yes | 296 | 
                                    
                                    79.1%
                                 | 
| 2 | No | 76 | 
                                    
                                    20.3%
                                 | 
| Sysmiss | 238 |