| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 50 | 
                                    
                                    2.5%
                                 | 
| 2 | no | 182 | 
                                    
                                    9.1%
                                 | 
| 999 | Missing | 1776 | 
                                    
                                    88.4%
                                 |