| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 | 
                                    
                                    0.1%
                                 | |
| 1 | SI | 278 | 
                                    
                                    20.4%
                                 | 
| 2 | NO | 151 | 
                                    
                                    11.1%
                                 | 
| Sysmiss | 934 | 
                                    
                                    68.5%
                                 |