| Value | Category | Cases | |
|---|---|---|---|
| 1 | YES | 28 | 
                                    
                                    7.7%
                                 | 
| 2 | NO | 38 | 
                                    
                                    10.4%
                                 | 
| 3 | NA | 299 | 
                                    
                                    81.9%
                                 | 
| Sysmiss | 912 |