| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 2 | 
                                    
                                    0.6%
                                 | 
| 2 | NO | 6 | 
                                    
                                    1.7%
                                 | 
| Sysmiss | 348 | 
                                    
                                    97.8%
                                 |