| Value | Category | Cases | |
|---|---|---|---|
| 0 | pre-primary | 0 | 
                                    
                                    0%
                                 | 
| 1 | primary | 16 | 
                                    
                                    64%
                                 | 
| 2 | secondary lower | 5 | 
                                    
                                    20%
                                 | 
| 3 | secondary upper | 0 | 
                                    
                                    0%
                                 | 
| 4 | higher | 4 | 
                                    
                                    16%
                                 | 
| 8 | dk | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 15326 |