| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.4%
                                 | 
| 1 | Yes | 75 | 
                                    
                                    32.2%
                                 | 
| 2 | No | 157 | 
                                    
                                    67.4%
                                 | 
| Sysmiss | 127 |