| Value | Category | Cases | |
|---|---|---|---|
| 0 | 2643 | 
                                    
                                    72.9%
                                 | |
| 1 | 45 | 
                                    
                                    1.2%
                                 | |
| 99 | 23 | 
                                    
                                    0.6%
                                 | |
| Missing value | 914 | 
                                    
                                    25.2%
                                 |