| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 920 | 
                                                                 
                                    
                                    68.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 415 | 
                                                                 
                                    
                                    31.1%
                                 
                                                             |