| Value | Category | Cases | |
|---|---|---|---|
| 1 | SI | 30 | 
                                    
                                    9.5%
                                 | 
| 2 | NO | 21 | 
                                    
                                    6.6%
                                 | 
| Sysmiss | 266 | 
                                    
                                    83.9%
                                 |