| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 39 | 
                                    
                                    8.8%
                                 | 
| 2 | NO | 13 | 
                                    
                                    2.9%
                                 | 
| Sysmiss | 393 | 
                                    
                                    88.3%
                                 |