| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -77 | Does not apply | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| -7 | Does not apply (spontaneous) | 1 | 
                                    
                                    0.6%
                                 | 
| 1 | Yes | 2 | 
                                    
                                    1.2%
                                 | 
| 2 | No | 165 | 
                                    
                                    98.2%
                                 | 
| Sysmiss | 74 |