| Value | Category | 
                                    
                    
                        | 0 | Never attended | 
                                    
                    
                        | 1 | Entered school | 
                                    
                    
                        | 2 | Advanced | 
                                    
                    
                        | 3 | Repeating | 
                                    
                    
                        | 4 | Dropout | 
                                    
                    
                        | 5 | Left school 2+ years ago | 
                                    
                    
                        | 8 | Don't know | 
                            
            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.