| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 249 | 
                                    
                                    10.5%
                                 | 
| 2 | no | 460 | 
                                    
                                    19.5%
                                 | 
| 999 | Missing | 1653 | 
                                    
                                    70%
                                 |