| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 40 | 
                                    
                                    6.7%
                                 | 
| 2 | NO | 56 | 
                                    
                                    9.3%
                                 | 
| Sysmiss | 504 | 
                                    
                                    84%
                                 |