| Value | Category | 
                                    
                    
                        | 0 | None | 
                                    
                    
                        | 1 | Primary/Pre-primary/Adult | 
                                    
                    
                        | 2 | Completed primary/some secondary | 
                                    
                    
                        | 3 | Completed seconday/diploma | 
                                    
                    
                        | 4 | Some/completed university | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.