| Value | Category | 
                                    
                    
                        | 00 | NIU (not in universe) | 
                                    
                    
                        | 10 | None or incomplete primary | 
                                    
                    
                        | 11 | No education | 
                                    
                    
                        | 12 | Primary incomplete | 
                                    
                    
                        | 20 | Primary | 
                                    
                    
                        | 30 | Basic vocational | 
                                    
                    
                        | 40 | Secondary incomplete | 
                                    
                    
                        | 41 | Lower secondary | 
                                    
                    
                        | 42 | Vocational secondary, no certificate | 
                                    
                    
                        | 43 | General secondary, no certificate | 
                                    
                    
                        | 50 | Secondary completed | 
                                    
                    
                        | 51 | Vocational secondary completed | 
                                    
                    
                        | 52 | General secondary completed | 
                                    
                    
                        | 60 | Post-secondary | 
                                    
                    
                        | 61 | Post-secondary incomplete | 
                                    
                    
                        | 62 | Post-secondary completed | 
                                    
                    
                        | 63 | Training college | 
                                    
                    
                        | 70 | University | 
                                    
                    
                        | 71 | University, bachelor's | 
                                    
                    
                        | 72 | University, master's | 
                                    
                    
                        | 73 | University, doctorate | 
                                    
                    
                        | 99 | Unknown | 
                            
            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.