| Value | Category | Cases | |
|---|---|---|---|
| 0 | Pre-primay | 21 | 
                                
                                9.9%
                             | 
| 1 | Primary | 27 | 
                                
                                12.7%
                             | 
| 2 | Unclassified | 1 | 
                                
                                0.5%
                             | 
| 5 | Missing | 1 | 
                                
                                0.5%
                             | 
| 9 | NA | 162 | 
                                
                                76.4%
                             |