| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Yes | 63 | 
                                    
                                    76.8%
                                 | 
| 2 | No | 19 | 
                                    
                                    23.2%
                                 | 
| Sysmiss | 281 |