| Value | Category | Cases | |
|---|---|---|---|
| 0 | 6 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 1 | 274 | 
                                                                 
                                    
                                    54.2%
                                 
                                                             | 
                                                        
                    |
| 2 | 159 | 
                                                                 
                                    
                                    31.4%
                                 
                                                             | 
                                                        
                    |
| Missing value | 67 | 
                                                                 
                                    
                                    13.2%
                                 
                                                             |