| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 60 | 
                                    
                                    5.7%
                                 | 
| 2 | NO | 18 | 
                                    
                                    1.7%
                                 | 
| Sysmiss | 983 | 
                                    
                                    92.6%
                                 |