| 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) | 5 | 
                                    
                                    45.5%
                                 | 
| 2 | 2 | 
                                    
                                    18.2%
                                 | |
| 10 | 1 | 
                                    
                                    9.1%
                                 | |
| 15 | 3 | 
                                    
                                    27.3%
                                 | |
| Sysmiss | 349 |