| Value | Category | 
                                    
                    
                        | 0 | pre-school | 
                                    
                    
                        | 1 | primary | 
                                    
                    
                        | 2 | vocational | 
                                    
                    
                        | 3 | secondary | 
                                    
                    
                        | 4 | intermediate diploma | 
                                    
                    
                        | 5 | b,absc | 
                                    
                    
                        | 6 | non standard curriculum | 
                                    
                    
                        | 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.